:: Setup Attachment Size Limit on Postfix

21 sec read

:: What is Postfix
Postfix is a free and open-source mail transfer agent (MTA) that routes and delivers electronic mail. It is intended as a fast, easier-to-administer, and secure alternative to the widely-used Sendmail MTA. – WikiPedia
:: How to setup attachment size limit
+ checking limit size for attachment

postconf | grep message_size_limit
# default is 10MB
message_size_limit = 10240000

+ edit main.conf on this line

postconf -e "message_size_limit = 5240000"

+ checking new configuration

postconf | grep message_size_limit
# change to 5MB
message_size_limit = 5240000

+ restarting postif

/etc/init.d/postfix restart

:: Link
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2 Replies to “:: Setup Attachment Size Limit on Postfix”

  1. Hi
    I want to configure user wise restrictions like attachment size, message size, file extension blocking etc.

    Please let me know how to do it.

    1. Hello Prasad,

      vi /etc/postfix/main.cf
      #message/inbox size:
      mailbox_size_limit = 5240000
      # extension blocking
      mime_header_checks = regexp:/etc/postfix/mime_blocking

      vi /etc/postfix/mime_blocking
      # add like this
      /name=[^>]*.(file|extension|blocking)/ REJECT
      /name=[^>]*.(bat|com|exe)/ REJECT

      restart postfix

      i hope it helps.


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