Postfix: > postfix/sendmail[29314]: fatal: no login name found for user ID 1095
Wietse:
> Some process with UID=1095 invoked the Postfix sendmail command.
Postfix:
> I assume this is why my mail is not being delivered, but how does a process
> use a non existing user id?
Perhaps the Postfix sendmail command is invoked by a program
that has no read permission for the UNIX password database.
Check your SElinux, AppArmor, etc. logs for warnings.
Wietse
