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Postfix block PDF or ZIP files attachments

Q. How do I block all PDF or ZIP files attachments under Postfix Mail Server?

A. You can easily block email attachments using mime header check.

Open postfix config file

Login as the root, enter:
# vi /etc/postfix/main.cf

Block zip or pdf files

Use mime_header_checks postfix config directive, enter:
mime_header_checks = regexp:/etc/ostfix/block_attachments
Save and close the file. Open /etc/ostfix/block_attachments file and append code as follows:
/name=[^>]*\.(pdf|zip)/ REJECT
Save and close the file.

Restart Postfix MTA

You must restart or reload postfix:
# /etc/init.d/postfix reload

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{ 4 comments… add one }
  • Mustafa September 20, 2011, 2:08 pm

    This will block attachments for all the accounts on the server, what I want to do is block all outgoing attachments for one account.
    Is there is a way to do that ?

  • Itelica April 26, 2013, 8:19 am

    This worked for us, thanks. Just one thing, you have missed out the P in postfix in the regexp line entry. We noticed it and changed it but others may not.

  • Ramesh July 23, 2014, 5:08 pm


    Please advice me how to block zip file include exe in postfix.

    Thanks for advance

  • dxman August 15, 2014, 12:32 pm

    hi admin,
    i am not getting bounce back email if the user tried to send email with the ( exceeded quota )attachment. mail deliver to recipient but the attachment is drop by server (if attach using the outlook)

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