Postmark is officially a "Fast, Reliable Email Delivery Service | SMTP | API" focused on getting transactional and marketing email to the inbox on time.
CATEGORY · 📧
Email Service providers
Compare 98 email services for webmasters, covering transactional email APIs, email marketing, business mailboxes and email testing tools.
All categories
⚡ Automation · 70
☁️ Cloud Server · 355
🚀 CDN Acceleration · 74
✅ Productivity · 99
🌐 Domain Registration · 147
📝 CMS · 114
💳 Payment Platform · 275
🛡️ Security · 111
📊 Analytics · 54
🤖 AI Platform · 71
💬 Communication · 196
🎨 Design Assets · 94
💰 Ad & Affiliate Monetization · 6
🗄️ Backend & Database (BaaS) · 1
📧 Email Service · 98
🔍 SEO & Marketing · 48
🛠️ Developer Tools · 64
📈 Monitoring & Observability · 63
⚖️ Compliance & Legal · 6
💾 Backup & Migration · 6
👥 Community & Forum · 6
🧪 Testing & Optimization · 6
📋 Form & Survey · 6
🤝 Freelance Marketplace · 6
🔤 Web Fonts · 6
🖼️ Media Optimization · 6
📉 Data Visualization & BI · 6
Email Service
ConvertKit (renamed Kit in 2024) is an email marketing platform for creators, known for tag-based subscriber management, visual automations, and its creator ecosystem; kit.com returns 403 to automated requests, so this entry relies on historical public material.
Klaviyo is officially an "AI Marketing Platform & B2C CRM | Email & WhatsApp", unifying marketing and service as an AI-first B2C CRM powered by K:AI agents for personalized outreach.
Tencent Exmail (exmail.qq.com) calls itself the only business mailbox that can send and receive mail inside WeChat, bundling a free domain with paid plans starting at 100 CNY per account per year, plus a limited free trial.
Resend is officially "Email for developers": transactional and marketing email delivery at scale, pitched as reaching humans instead of spam folders.
SendGrid's official entry now lives at twilio.com: trusted email API plus marketing campaigns, delivered through Twilio.com.
Fastmail is officially "Email and calendar made better": fast, private email hosting and calendar for individuals and businesses, built to save time.
Proton Mail is officially "Get a free email account with privacy and encryption": the vendor cites the world's largest secure email service with over 100 million users across web, iOS, Android, and desktop.
Tuta is officially "Turn ON privacy for free with secure emails, calendars & contacts": free encrypted mail with no ads and quantum-resistant encryption.
beehiiv is a creator newsletter platform founded in 2021 in New York, hosting 60,000+ newsletters with editing, growth, ad monetization, and paid subscriptions in one place.
Substack is officially "Where independent creators publish": a subscription platform for newsletters, podcasts, and video shows, free to start with paid subscription monetization.
Gmail is Google Workspace's email service, officially emphasizing security, privacy, and ease of use for both personal and business use, governed centrally through the Workspace admin console.
Outlook's official entry point outlook.live.com is Microsoft's free consumer webmail tied to the Outlook.com account system, offering web mail plus calendar basics.
Amazon SES is AWS's cloud email service, transacting more than a trillion emails a year for customers per the vendor; it covers transactional, marketing, and newsletter email on pay-as-you-go pricing, with shared, dedicated, or owned IPs plus Mail Manager for inbound.
Mailchimp is officially an "Email & SMS Marketing Platform" using real-time behavior data and AI to convert more customers, with a free start.
Zoho Mail is officially "Secure & Professional Business Email for your Organization": ad-free business email hosting with a clean, easy-to-use interface plus integrated calendar, contacts, and notes.
Drip is an ecommerce-focused email marketing and automation platform known for behavioral triggers, segmentation, and revenue attribution; drip.com returns 403 to automated requests, so capabilities and pricing should be confirmed officially.
Mailtrap is officially "We Send Emails | Live Sending, Sandbox, Marketing": transactional, bulk, and marketing sending via API or SMTP, plus inbound email and sandbox testing, trusted by 150,000+ monthly active users.
NetEase Enterprise Mail (qiye.163.com) markets a secure, stable business email system with international-standard security certificates, professional anti-spam, 29 years of mail operations, a 1,500-person support team, and over 1.3 million businesses per its own copy.
Brevo (formerly Sendinblue) is officially an "Email & SMS Marketing, CRM & Automation Platform", combining email and SMS marketing with CRM and automation, and billing by sends rather than contacts so large-but-quiet lists cost less.
MXroute is officially "Email Hosting for Your Domains": no-nonsense email hosting since 2013, with unlimited domains and accounts on every plan.
listmonk is officially "Free and open source self-hosted newsletter, mailing list manager, and transactional email", covering subscriptions, list management, and transactional sending.
Mailgun is officially a "Transactional Email API Service For Developers": send, receive, and track email through APIs built for developers.
Alibaba Enterprise Mail is Alibaba Cloud's business email service, with its official entry at qiye.aliyun.com; the site states 18 years of focus (2009-2026). Its value is less as a standalone product than as part of the Alibaba Cloud account, DNS, billing, and DingTalk stack.
MailerSend is officially an "Email Sending Service": send email via API or SMTP with a free signup and top-rated support.
SparkPost's official entry is now bird.com/email-api: transactional email, marketing campaigns, and reply handling in one place within the Bird platform, with APIs and SDKs.
Mautic is officially "Open Source Marketing Automation": free and open source marketing automation with email marketing and lead management, self-hostable.
MailPoet is a WordPress email marketing plugin trusted by 600,000+ websites: send newsletters and post notifications and automate marketing inside WordPress and WooCommerce.
Omnisend is officially "Official Email Marketing Software for Ecommerce": email and SMS marketing for ecommerce brands on Shopify, WooCommerce, and more, claiming $79 returned for every $1 spent.
SocketLabs is officially "The world's smartest Email and Analytics Platform", pairing high-volume delivery with delivery analytics for senders who need visibility.
MailerLite is officially "Create Email Marketing Your Audience Will Love": digital marketing tools to grow audiences faster and drive revenue smarter, with 24/7 award-winning support.
mailbox.org is officially a mailbox suite for private and business customers: an email-centered digital workspace with cloud storage, Office, and Meet, emphasizing 100% security and GDPR compliance.
Posteo is officially "Email green, secure, simple and ad-free": a German mailbox service built around privacy, sustainability, and an ad-free subscription model.
Mailmeteor is officially "Send personalized emails and manage replies at scale", combining mail merge and reply management, typically layered on Gmail workflows.
GetResponse is officially an "Automation, Landing Pages and Email Marketing Platform", combining marketing automation, landing pages, and email to automate sales and track revenue.
StartMail is officially "Private, Secure and Encrypted Email You Can Trust", using encryption and customizable aliases to protect identity and data.