Looking for a newsletter company to educate your subscribers about your services and products and foster customer loyalty? We evaluated numerous verified client reviews and case studies from industry-leading agencies to curate a list of top newsletter agencies to help businesses like yours find the right partner. Customize your search by location, team size, budget, and other criteria to begin your search. 

Best Newsletter Agencies

758 Companies - Rankings updated: March 31, 2026

Every email marketing company on DesignRush is evaluated for demonstrated expertise and authentic client reviews to support your decision. Certain placements are paid.

  • Helping organizations unlock scalable growth through data-led strategies and market intelligence.

    Helping organizations unlock scalable growth through data-led strategies and market intelligence.

    Omni Media Consultings vision is to be the global catalyst for marketing transformation - leading enterprises into a future where every marketing decision is intelligent, every campaign is impactful, and every customer interaction is meaningful.  [... view Omni Media Consulting profile ]
    Location
    Buffalo, New York
    Number of Employees
    Under 49
    Average Hourly Rate
    $75/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    2 Projects Listed
  • Marketing made simple. We're here for however long YOU need us!

    Marketing made simple. We're here for however long YOU need us!

    AW Digital Marketing is a full-service marketing agency offering content marketing, SEO (Search Engine Optimization), Google Ads, social media marketing/management, website design/redesign/management, graphic design, mobile application development, marketing strategy advice and direction, email/SMS  [... view AW Digital Marketing profile ]
    Location
    Kansas City, Missouri
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    Under $1,000
    Portfolios Count
    5 Projects Listed
  • Blending Creativity, Technology, and Strategy To Shape What Matters Most.

    Blending Creativity, Technology, and Strategy To Shape What Matters Most.

    Mattered is an award-winning digital marketing agency specializing in email & sms marketing, branding & design, development, and paid media. We are a people first agency, dedicated to putting our clients and their customers at the center of everything we do.  [... view Mattered profile ]
    Location
    Irvine, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    5 Projects Listed
  • Creating unique web design solutions since 2004

    Creating unique web design solutions since 2004

    The London Web Design Agency has been creating unique web design and build solutions for our valued clients since 2004.  [... view London Web Design Agency profile ]
    Location
    London, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    6 Projects Listed
  • Revenue With Integrity

    Revenue With Integrity

    We believe in generating revenue for our clients–and ourselves–with integrity. We pride ourselves on honesty and openness; we encourage our clients to be involved in our process. We firmly believe in providing value first and foremost. We care about the individuals who make up a company and the  [... see all Revity Marketing Agency reviews ]
    Location
    American Fork, Utah
    Number of Employees
    Under 49
    Average Hourly Rate
    $70/hr
    Minimal Budget
    $1,000 - $10,000
  • Digital Agency with a Lasting Impact

    Digital Agency with a Lasting Impact

    At CodeMasters, we keep the focus on quality from start to finish. This ensures that your deliverables are accurate and satisfy your design needs. We build your website the way that you want it, and deliver it when you want it. Our team of developers work with you to determine your optimal operational date  [... view CodeMasters profile ]
    Location
    Hamilton, Canada
    Number of Employees
    Under 49
    Average Hourly Rate
    $75/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    4 Projects Listed
  • Fire Out Your Message – Drum Up Some Business

    Fire Out Your Message – Drum Up Some Business

    Our easy-to-use email marketing software will empower you to send effective email campaigns and track your marketing success with ease.  [... see all Firedrum Marketing reviews ]
    Location
    Scottsdale, Arizona
    Number of Employees
    50 - 99
    Average Hourly Rate
    $30/hr
    Minimal Budget
    Under $1,000
  • Your Restaurant Marketing Partner

    Your Restaurant Marketing Partner

    Restaurant Brand Builders is a marketing agency dedicated to growing restaurants. We help independent restaurants overcome limited visibility and customer reach by implementing targeted digital marketing strategies. Our sole focus is more visibility, more guests, more foot traffic, more revenue!  [... view Restaurant Brand Builders profile ]
    Location
    Houston, Texas
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    10 Projects Listed
  • Designing Concepts Into Clicks

    Designing Concepts Into Clicks

    We're looking for businesses that need a strong online presence. You can expect your rebuilt or new website to utilize organic and paid SEO to reach search ranking goals, engage on social media platforms, run targeted online ads, deliver monthly blog posts, create valuable content for marketing, and leverage  [... view Design Data Concepts, LLC profile ]
    Location
    Scottsville, Virginia
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    8 Projects Listed
  • Achieve Digital Success Anytime.

    Achieve Digital Success Anytime.

    Anytime Digital Marketing excels in providing online marketing services for many types of businesses and industries. Our customer service is first class! We ensure that your short and long term goals are identified with your marketing strategy. In addition, we will provide you with knowledgeable experience  [... view ANYTIME profile ]
    Location
    Houston, Texas
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    8 Projects Listed
  • Take Your Business To The Next Level.

    Take Your Business To The Next Level.

    We are a Web Design and Development Agency. As well as a provider of IT solutions. We help businesses and companies implement IT solutions tailored to their needs. We help our clients grow by providing innovative technological tools to achieve their goals. We think big, and if you do too, we can work together  [... view Alva Technology profile ]
    Location
    Ciudad Guzmán, Mexico
    Number of Employees
    Under 49
    Minimal Budget
    Under $1,000
    Portfolios Count
    8 Projects Listed
  • FUTURE-PROOF DIGITAL SOLUTIONS

    FUTURE-PROOF DIGITAL SOLUTIONS

    Are you a startup or enterprise looking to take your business to the next level? Blank Space offers a comprehensive range of technology consultancy services to help you generate ideas, build products and accelerate growth. We can help you transform your business and reach new heights.  [... see all Blank Space reviews ]
    Location
    Mississauga, Canada
    Number of Employees
    Under 49
    Average Hourly Rate
    $110/hr
    Minimal Budget
    $25,000 - $50,000
    Portfolios Count
    1 Project Listed
  • Web design agency specialising in Web Design, eCommerce, Branding and Digital Marketing. A highly rated web agency working with businesses of all sizes and budgets to create engaging projects.  [... view Arrival Design Ltd profile ]
    Location
    Willerby, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $100/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    1 Project Listed
  • Helping Brands Find Their Voice and Tell Their Story.

    Helping Brands Find Their Voice and Tell Their Story.

    Cedar Creative is your go-to destination for building a brand that stands out. Our dedicated team of strategists, designers, photographers, and videographers is committed to transforming businesses and creating lasting impact.  [... view Cedar Creative Inc profile ]
    Location
    Toronto, Canada
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    4 Projects Listed
  • Success with every search.

    Success with every search.

    Future SEO is an SEO and Digital Marketing agency based in Bucharest, founded in 2024. We cater to those seeking a strong online presence, supported by advanced strategies grounded in solid SEO and Digital Marketing knowledge.  [... view Future SEO profile ]
    Location
    Bucharest, Romania
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    Under $1,000
    Portfolios Count
    1 Project Listed
  • Marketing Solutions Designed to Perform

    Marketing Solutions Designed to Perform

    We don't just make brands look good — we make them work. Wide Angle Creative builds strategy-led branding, content + websites that connect + perform. Smarter questions, sharper ideas, faster turnarounds. When the stakes are high, our work delivers clarity, impact + real growth.  [... view Wide Angle, LLC. profile ]
    Location
    Houston, Texas
    Number of Employees
    Under 49
    Average Hourly Rate
    $149/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    6 Projects Listed
  • Empowering brands with unparalleled e-commerce excellence for online success!

    Empowering brands with unparalleled e-commerce excellence for online success!

    With 32 official Adobe Commerce certifications and recognition as an Adobe Solution Partner, our development team ensures expertise and a commitment to excellence you can rely on.Profstep Agency, is a full-cycle development company delivering best-in-class Adobe Commerce solutions to B2B and B2C c  [... view Profstep LLC profile ]
    Location
    Dover, Delaware
    Number of Employees
    Under 49
    Average Hourly Rate
    $85/hr
    Portfolios Count
    12 Projects Listed
  • Run A Hassle-free Business! Remove the bottlenecks that prevent your growth!

    Run A Hassle-free Business! Remove the bottlenecks that prevent your growth!

    Serenichron is dedicated to proactively identifying the pressing needs of small and medium businesses and offering holistic business analysis and development services. Through our commitment to fairness, transparency, and honesty, we aim to build lasting partnership and provide scalable, affordable solutions  [... view Serenichron SRL profile ]
    Location
    Bragadiru, Romania
    Number of Employees
    Under 49
    Average Hourly Rate
    $60/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    10 Projects Listed
  • Ideas unleashed.

    As a communications agency, we connect people with brands. We put our hearts into it. It's more than just a job. It's a mission. Since 1972. Always on the move and full of curiosity, we work together to find the right paths for our clients and their customers. So that they can move toward each other and grow  [... view Koch Essen Kommunikation+Design GmbH profile ]
    Location
    Essen, Germany
    Number of Employees
    50 - 99
    Average Hourly Rate
    $90/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    2 Projects Listed
  • True heroes always have a mission!

    True heroes always have a mission!

    At Performance Heroes, we champion noble causes, striving for ethical and enduring relationships between clients and partners. Our agency prioritizes the interests of all parties involved to achieve our shared objective of fostering lasting cooperation.  [... view Performance Heroes profile ]
    Location
    Hamburg, Germany
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
  • We move companies into the future.

    We move companies into the future.

    We implement comprehensive solutions for clients worldwide with the goal of boosting businesses, positioning brands, and increasing sales.  [... see all Perinola reviews ]
    Location
    Guatemala City, Guatemala
    Number of Employees
    Under 49
  • The Marketing Agency Helping Businesses Grow

    The Marketing Agency Helping Businesses Grow

    Zeph is a Romanian-based agency exclusively focused on increasing business value through digital marketing strategies, an integrated ecosystem of tools and professional partners. We believe growth isn't just about numbers, it's about the courage to dream, perseverance and smart decisions. At Zeph, we deliver  [... view Zeph profile ]
    Location
    Bucharest, Romania
    Number of Employees
    Under 49
    Average Hourly Rate
    $70/hr
    Minimal Budget
    $1,000 - $10,000
  • eCommerce Agency | Acquire & Retain More Customers

    eCommerce Agency | Acquire & Retain More Customers

    We help 7 & 8-figure eCommerce brands acquire more customers and retain them with performance marketing that drives profitable growth.  [... view 1 At Bat Media profile ]
    Location
    Toronto, Canada
    Number of Employees
    Under 49
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    8 Projects Listed
  • Fully Scalable Digital Growth Agency.

    Fully Scalable Digital Growth Agency.

    Pactx is dedicated to partnering with you on your digital transformation journey and we pride ourselves in being the anti-agency. Your success is our success! Change is hard but your competitors are not sitting idly by waiting for you. To evolve we must continually improve, learn, and grow and PactX will help  [... view Pactx, Inc profile ]
    Location
    San Clemente, California
    Number of Employees
    Under 49
    Average Hourly Rate
    $200/hr
    Minimal Budget
    $50,000 & Up
    Portfolios Count
    3 Projects Listed
  • Building Connections Through Digital Marketing

    Building Connections Through Digital Marketing

    At Hivehouse Digital, our team of marketers, designers, and developers helps B2B and home services companies grow their sales and marketing. We specialize in website design and development, Hubspot, and branding.  [... view Hivehouse Digital profile ]
    Location
    Ann Arbor, Michigan
    Number of Employees
    Under 49
    Average Hourly Rate
    $175/hr
    Portfolios Count
    5 Projects Listed
  • Wanna Grow? Go with the Glasses!

    Wanna Grow? Go with the Glasses!

    Geeks for Growth stands as a comprehensive digital marketing powerhouse, serving a global clientele towards transformative potential of SEO, marketing, white labeling and print design. Our full-service offerings encompass brand design and marketing, resonating profoundly with businesses worldwide.  [... view Geeks For Growth profile ]
    Location
    Salt Lake City, Utah
    Number of Employees
    Under 49
    Average Hourly Rate
    $60/hr
    Minimal Budget
    Under $1,000
    Portfolios Count
    5 Projects Listed
  • Your brand's unfair advantage.

    Your brand's unfair advantage.

    Forge Apollo's award-winning digital marketing, website design, and video production team sets your brand up for success. We drive unrivaled results through our unique blend of video and digital marketing expertise, turning great ideas into effective websites, content, and ad campaigns.  [... view Forge Apollo profile ]
    Location
    Newtown Square, Pennsylvania
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    4 Projects Listed
  • Kinetic Marketing & Creative is a full-service marketing agency in Billings, Montana.

    Kinetic Marketing & Creative is a full-service marketing agency in Billings, Montana.

    Kinetic Marketing & Creative is a full-service marketing agency in Billings, Montana. Our agency is ready to help your business move forward. Our team features experience strategists, designers, marketers, writers, creatives and account directors.  [... view Kinetic Agency profile ]
    Location
    Billings, Montana
    Number of Employees
    Under 49
    Portfolios Count
    7 Projects Listed
  • Get More Calls From Customers Searching on Google

    Get More Calls From Customers Searching on Google

    We help service businesses generate more leads through SEO, website design, and branding built for Google and AI-powered search.  [... view FOG Digital Marketing profile ]
    Location
    San Antonio, Texas
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    4 Projects Listed
  • Your Partner in Digital Growth

    Your Partner in Digital Growth

    At Enchantment Marketing, we specialize in transforming visions into digital success. Based in the heart of Albuquerque, NM, our agency combines innovation with marketing excellence to empower brands across various industries. Our expertise lies in leveraging cutting-edge AI and automation technologies to  [... view Enchantment Marketing LLC profile ]
    Location
    Albuquerque, New Mexico
    Number of Employees
    Under 49
    Average Hourly Rate
    $70/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    3 Projects Listed
  • Aeard Winner Packaging Design Company

    Aeard Winner Packaging Design Company

    AGÊNCIA TARGET is a full service agency with great experience with packaging design. More than 26 years working with creative solutions and integrated strategies. We work with the entire solution and execution for POS actions, campaigns and stands.  [... view Target Design profile ]
    Location
    Sao Paulo, Brazil
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    7 Projects Listed
  • It's Time To Tell Your Story.

    It's Time To Tell Your Story.

    Campfire Digital is a full-service digital marketing agency that can manage your complete digital marketing campaign from beginning to end. We coordinate everything into one cohesive system that will help you cement a strong and recognizable brand, form stronger ties to your target market and convert web  [... view Campfire Digital profile ]
    Location
    Denver, Colorado
    Number of Employees
    Under 49
    Average Hourly Rate
    $175/hr
    Minimal Budget
    $10,000 - $25,000
    Portfolios Count
    4 Projects Listed
  • Get Social, Get Noticed

    Get Social, Get Noticed

    Scott Social is a boutique social media agency that specializes in creating compelling content across digital marketing platforms. Scott Social specializes in organic social media management, influencer marketing, user-generated content creation and paid ads. Based in Phoenix, serving clients everywhere.  [... view Scott Social profile ]
    Location
    Phoenix, Arizona
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
  • Graphic design specialising in branding, corporate identity, logo, and web page visualisation

    Graphic design specialising in branding, corporate identity, logo, and web page visualisation

    Im John Cartwright, a down-to-earth freelance graphic designer living in Wales, UK. I love what I do! With a blend of digital and traditional skills that I've picked up over the years, I specialise in print and on-line branding, banners, logo design, point-of-sale design, and visualisations.  [... view The Designeye profile ]
    Location
    Llanelli, United Kingdom
    Number of Employees
    Under 49
    Average Hourly Rate
    $25/hr
    Minimal Budget
    Under $1,000
    Portfolios Count
    5 Projects Listed
  • Marketing consultancy spanning disciplines and industries.

    Marketing consultancy spanning disciplines and industries.

    Sparkcade is a marketing agency dedicated to delivering marketing and communication excellence to companies of all sizes. See where us joining in could help you power-up your acquisition strategy and slay your competition. We put the "fun" in marketing and sales funnel.  [... view Sparkcade Marketing profile ]
    Location
    Kansas City, Missouri
    Number of Employees
    Under 49
    Portfolios Count
    1 Project Listed
  • You And Your Business Are Our Priority

    You And Your Business Are Our Priority

    We offer custom web design and WordPress websites that are strategically built for your specific business or organization. Our unique approach and award-winning designs improve leads and convey your brand's message to the appropriate target audience. Every website we build is responsive, mobile-friendly, and  [... view Entice Design profile ]
    Location
    Towson, Maryland
    Number of Employees
    Under 49
    Average Hourly Rate
    $155/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    7 Projects Listed
  • We tell better stories for brands who want better connections.

    We tell better stories for brands who want better connections.

    To deliver award-winning, world-class creative solutions that foster unforgettable experiences for consumers and build market value for companies. Our clients set the bar in their industry and are envied by their competitors. Our team of kick-ass talent is proud and empowered of the work we do.  [... view Brand Poets profile ]
    Location
    Miami, Florida
    Number of Employees
    Under 49
    Average Hourly Rate
    $150/hr
    Minimal Budget
    $1,000 - $10,000
    Portfolios Count
    5 Projects Listed
  • The Write Way To Market

    The Write Way To Market

    Your organization has knowledge, expertise and a mission that no one else can match. We can help you turn that knowledge into content that drives your marketing, builds your brand, and raises your profile and visibility.  [... view Market It Write profile ]
    Location
    New York City, New York
    Number of Employees
    Under 49
  • Entrust us with managing your business profiles.

    Entrust us with managing your business profiles.

    Specta serves as a comprehensive solution for all your online marketing requirements, excelling in various domains such as online advertising, social media marketing, email campaigns, Google, and YouTube Ads. As a market leader, we offer expertise across diverse digital channels to optimize your online  [... view Specta profile ]
    Location
    Zagreb, Croatia
    Number of Employees
    Under 49
    Average Hourly Rate
    $50/hr
    Minimal Budget
    Under $1,000
  • An artisanal laboratory of digital communication specialists.

    An artisanal laboratory of digital communication specialists.

    Pervia originated in Modena as a digital communication artisan workshop. Our goal is to guide businesses, brands, and individuals through the ever-changing digital landscape, brimming with endless opportunities and complexity.  [... view Pervia profile ]
    Location
    Fiorano Modenese, Italy
    Number of Employees
    Under 49
    Average Hourly Rate
    $30/hr
    Minimal Budget
    $1,000 - $10,000
  • Weve got you covered.

    Weve got you covered.

    For 14 years, we've proudly served 100+ enterprises in New Zealand and Australia, earning recognition through various awards. We pride ourselves on being S.A.F.E: small, agile, fast, and ethical, ensuring transparency, honesty, and results-oriented focus for our clients. Let's discuss how we can assist you in  [... view Whippet Digital profile ]
    Location
    Ōhope, New Zealand
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
  • Graphic Designer & Design Consultant

    Graphic Designer & Design Consultant

    Amanda Chung is a versatile and innovative graphic designer known for her strong work ethic and meticulous attention to detail. She excels in collaboration and communication, both written and verbal, and is a dynamic team player. Amanda is passionate about enhancing a company's quality and growth with her  [... view Amanda Chung profile ]
    Location
    Toronto, Canada
    Number of Employees
    Under 49
  • High-Conversion Websites & Local SEO for Small Business Growth.

    High-Conversion Websites & Local SEO for Small Business Growth.

    Web Promote Pro is a West Virginia–based digital marketing studio that turns under-performing websites into nonstop lead machines. We specialize in conversion-focused web design, local SEO, and Google Business Profile optimization for service businesses across the Mountain State and beyond. Whether you need  [... view Web Promote Pro profile ]
    Location
    Falling Waters, West Virginia
    Number of Employees
    Under 49
    Average Hourly Rate
    $20/hr
    Minimal Budget
    Under $1,000
  • Engagement Traffic Revenue Growth

    Engagement Traffic Revenue Growth

    Fuze7 Digital Marketing is a team of channel experts, strategic thinkers, and data-driven marketers focused on delivering measurable results through deliberate, well-executed campaigns.  [... view Fuze7 Digital Marketing profile ]
    Location
    Portland, Oregon
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
  • Reach More Convert Faster Grow Smarter

    Reach More Convert Faster Grow Smarter

    Discover Zynova - a results-driven digital marketing agency helping emergency clinics, auto shops, law firms, and medspas grow online visibility and lead generation.  [... view Zynova profile ]
    Location
    Houston, Texas
    Number of Employees
    50 - 99
    Average Hourly Rate
    $40/hr
    Minimal Budget
    $1,000 - $10,000
  • PR That Delivers Real Competitive Advantage

    PR That Delivers Real Competitive Advantage

    Empica is one of the South West UKs most established PR and communications agencies, combining decades of media experience with creative content and reputation management. Based in Bristol, we deliver trusted, results-driven PR campaigns across sectors including property, healthcare, education, and  [... view Empica profile ]
    Location
    Bristol, United Kingdom
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
  • An Ambitious Online Marketing Agency

    An Ambitious Online Marketing Agency

    eRocket optimizes all aspects of online marketing to achieve your goals. We do this in collaboration with the client, carrying out online marketing activities, sharing knowledge, and continuously exploring online opportunities.  [... view ERocket profile ]
    Location
    's-Hertogenbosch, Netherlands
    Number of Employees
    Under 49
    Minimal Budget
    $1,000 - $10,000
  • Your Creative Department

    Your Creative Department

    Brimming Design is a creative agency offering informational websites, logo design, graphic design for print and digital display, content creation and more. Our small size and great service mean youll get what you want with painless revisions and a smile. We're not happy until you are.  [... view Brimming Design profile ]
    Location
    Toledo, Ohio
    Number of Employees
    Under 49
    Average Hourly Rate
    $95/hr
    Minimal Budget
    Under $1,000

About The Author and Expert Reviewer

Vanessa Maandal is a digital writer with expertise in content marketing and creative direction. She has developed successful campaigns for global brands, such as Boehringer Ingelheim, Kellogs Singapore, and Friesland Campina. At DesignRush, she writes content focused on marketing strategies led by award-winning agencies to connect them with like-minded organizations and individuals.

Head of Email Marketing

Ildiko Szabo built her marketing experience by working at ROSEYs and Cootbie, managing email campaigns, newsletters, and podcasts. She is fluent in five languages and holds a master’s degree in business administration, management, and operations. As the current Head of Email Marketing at DesignRush, she increased email open rates from 14% to 55%.