Postfix
Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.
Postfix Alternatives [Page 5]
The best Postfix alternatives based on verified products, community votes, reviews and other factors.
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Google's encompassing suite of cloud-based business apps.
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Lettre is a mailer library for Rust.
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Warm up your cold email inbox, and never land in spam anymore!
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Scale your business email & marketing messages with Amazon Simple Email Service (SES), a cost-effective and reliable cloud email service. Sign up today.
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esmtp is a user configurable relay-only Mail Transfer Agent (MTA) with a sendmail compatible syntax.
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E-mail Hosting for Your Domains
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An email sandbox to inspect and debug emails in dev, staging, and QA environments before sending them to recipients in production.
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Agile goal and performance management
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Open source mail delivery platform, alternative to Mailgun or Sendgrid
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MailChimp is the best way to design, send, and share email newsletters.
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A set of powerful APIs that enable you to send, receive and track email from your app effortlessly whether you use Python, Ruby, PHP, C#, Node.js or Java.
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Boomerang for Outlook offers email productivity tools to track, schedule and send mails at the right time.
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All your E-mail, from all your accounts, in one place. Cypht is like a news reader, but for E-mail.
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Horde Groupware is a free, enterprise ready, browser based collaboration suite.