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$ which sendmail doesn't return anything. sendmail IS NOT installed in non privileged users' PATH => you observer expected/normal result. sendmail is expected to be executed by other programs like mail which use full/absolute path. can not write to queue directory /var/spool/mqueue-client/ (RunAsGid=115, required=0): Permission denied fix /var/spool/...


Does it work if you run this: echo "Subject: sendmail test" | sudo sendmail /usr/sbin/sendmail -v The distinction being that you are running echo as root, but not sendmail. Thus the message: "(RunAsGid=115, required=0): Permission denied" The "115" is the Group Id of your user, and it is expecting "0" (which is roots)

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