postfix: can’t create user output file

people alerted me that they got an email bounce saying:

Final-Recipient: rfc822;
Original-Recipient: rfc822;
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; can't create user output file

it turned out that my local mail file that I keep as a backup was bigger than 1000 Megabyte. Seems to be that postfix (or whichever program delivers the mail locally to /var/spool/mail) does not like to write to files that are bigger than that number. Scary the file grew to that size within one year.

One Response to “postfix: can’t create user output file”

  1. Ruel Joson Says:

    Hi Andrea,

    In the email settings of the user, try to add a new entry in the Additional email Addresses. I think the alias is maybe corrupted. Hope it helps. Thank you.


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