The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open… The Courier mail transfer agent (MTA) is an integrated mail/groupware server based on open commodity protocols, such as ESMTP, IMAP, POP3, LDAP, SSL, and HTTP. Courier provides ESMTP, IMAP, POP3, webmail, and mailing list services within a single, consistent, framework. Individual components can be customized, enabled or disabled at will.Certain portions of the Courier mail server – the mail filtering engine, the webmail server and the IMAP server – are also available as separate, smaller, packages that can be used with other mail servers.
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Courier-MTA
Alternatives
| # | Image | App Name | Features | Platforms | Price | Website Link |
| 1 | sSMTP | Linux | Free | Website | ||
| 2 |  |
OpenSMTPD | BSD Self-Hosted Linux |
Free | Website | |
| 3 |  |
Exim | Linux Mac |
Free | Website | |
| 5 |  |
Postfix | Linux Mac |
Free | Website | |
| 6 |  |
Mail-in-a-box | Roundcube | Self-Hosted | Free | Website |
| 7 |  |
PowerMTA | Windows Self-Hosted Linux |
Commercial | Website | |
| 8 |  |
Sendmail | Linux Mac |
Free | Website | |
| 9 |  |
Microsoft SMTP Server | Windows | Commercial | Website | |
| 10 | Dragonfly Mail Agent | Linux BSD |
Free | Website |