Apps Like esmtp & Comparison with Popular Alternatives For Today

esmtp 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.