"postdrop: File too large" or "fatal: message file too big" log entries, but attachment is smaller than 10Mb

Solution Verified - Updated -

Issue

  • Messages are being dropped with the following log, although attachment size is somewhere between 7 and 8Mb. Default postfix configuration for maximum message size is 10Mb. Expected logs:
Apr 01 16:05:22 hostname postfix/postdrop[22221]: warning: uid=0: File too large
Apr 01 16:05:22 hostname postfix/sendmail[22220]: fatal: root(0): message file too big

Environment

  • Red Hat Enterprise Linux (RHEL)
  • postfix

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