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On a server when you enable SMTP(S) in postfix master.cf file, you may have one or more of the following errors. The reason for these errors is that the definition of the SMTP(S) ports in /etc/services is missing. Postfix - Errors and solutionPossible encountered errorsYou may have one or more of the following errors: # /path/to/mail_script.sh postdrop: warning: unable to look up public/pickup: No such file or directory postdrop: warning: unable to look up public/pickup: No such file or directo