Merge branch 'fix/sendmail' into 'develop'

Fix ability to use sendmail on Linux distros with systemd

See merge request pleroma/pleroma!3102

installation/pleroma.service

@@ -31,8 +31,6 @@ ProtectHome=true
 ProtectSystem=full
 ; Sets up a new /dev mount for the process and only adds API pseudo devices like /dev/null, /dev/zero or /dev/random but not physical devices. Disabled by default because it may not work on devices like the Raspberry Pi.
 PrivateDevices=false
-; Ensures that the service process and all its children can never gain new privileges through execve().
-NoNewPrivileges=true
 ; Drops the sysadmin capability from the daemon.
 CapabilityBoundingSet=~CAP_SYS_ADMIN