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  • a strace might indicate what send-mail is doing right before issuing that error Commented Dec 28, 2017 at 23:14
  • I'm sorry, I have no idea how to use strace :/ I have no significant programming (or debugging) experience. Commented Dec 29, 2017 at 1:08
  • Please add debugging output by pasting the output of: echo test|mail -v -s "test" [email protected] Commented Dec 31, 2017 at 18:07