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  • esmtp is no longer being maintained. Commented Aug 6, 2013 at 7:56
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    nullmailer has a serious SMTP compliance problem : it retries infinitely when given an SMTP permanent error. This can cost you real money if you pay for bandwidth/transit bugs.debian.org/cgi-bin/bugreport.cgi?bug=329192 Commented Feb 6, 2014 at 16:13
  • @telent: you should not use nullmailer in such a scenario. Commented Feb 7, 2014 at 12:09
  • Thanks! The config guide at troubleshooters.com/linux/nullmailer notes a security issue with nullmailer: it exposes passwords on the command line, or at least used to do that. Other conversations note that mstmp makes it a bit less clear how to enqueue mail than nullmailer. Commented Jun 12, 2019 at 3:35