Lettre Alternatives

Inbucket is an email testing application; it will accept messages for any email address and make...

Open Source

Postfix is a mail transfer agent (MTA) that routes and delivers electronic mail.

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

MailHog is an email testing tool inspired by MailCatcher, but easier to install.

Open Source

Configure SMTP e-mail in IIS when you want to deliver e-mail messages from your site.

Email Delivery Platform that delivers just in time.
 Great for businesses and individuals.

Open Source freemium

OpenSMTPD is a FREE implementation of the server-side SMTP protocol as defined by RFC 5321, with...

Open Source

sSMTP is a simple MTA to deliver mail from a computer to a mail server.

The #1 email warming service to improve your deliverability by generating realistic and meaningful engagement to your emails. Easy-to-use solution to help you land in the main inbox instead of the spam folder.

Visit website paid $19.5 / Monthly (Pro)

Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.

Email Testing for QA & Development Teams.

Mail-in-a-Box provides webmail and an IMAP/SMTP server for use with mobile devices and desktop mail software and also includes contacts and calendar synchronization.

Open Source

An email and SMTP testing tool with API for developers.

Warm up your cold email inbox, and never land in spam anymore!

Try for free freemium $9.0 / Monthly