esmtp is a user configurable relay-only Mail Transfer Agent (MTA) with a sendmail compatible syntax. esmtp is a user configurable relay-only Mail Transfer Agent (MTA) with a sendmail compatible syntax. It’s based on libESMTP supporting the AUTH (including the CRAM-MD5 and NTLM SASL mechanisms) and the StartTLS SMTP extensions.
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esmtp
Alternatives
| # | Image | App Name | Features | Platforms | Price | Website Link |
| 1 |  | sendEmail | Mac Windows Linux | Free | Website | |
| 2 | sSMTP | Linux | Free | Website | ||
| 3 |  | Postfix | Linux Mac | Free | Website | |
| 4 |  | Sendmail | Linux Mac | Free | Website | |
| 5 | msmtp | Linux Xfce | Free | Website | ||
| 6 |  | NikaMail | Linux Mac | Free | Website |
