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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