Author:
erics, December 7th, 2021
I needed to block email based on the Subject header. The solution is simple: Edit main.cf as root and uncomment or add:
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header_checks = regexp:/etc/postfix/header_checks |
Next, creaate or edit /etc/postfix/header_checks as root and add the following line:
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/subject:\sbad subject text here/ REJECT header_checks NO SPAM ALLOWED /subject:\stest subject text here/ DISCARD header_checks NO SPAM ALLOWED |
Finally, run sudo postfix reload NOTE: Do NOT add the “i” after the regular expression! It is case-insensitive by […]
Categories: How-To's, Technology Tags: Block, Check, Checks, Discard, Header, header_checks, headers, howto, PostFix, Reject, Spam, Subject, tips
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Author:
erics, June 3rd, 2011
By default, the Postfix SMTP server accepts any sender address. You block email addresses using the sender_access file:
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# cd /etc/postfix # vi sender_access baduser@baddomain.com REJECT # postmap hash:sender_access # vi recipient_access baduser@baddomain.com REJECT # postmap hash:recipient_access # vi main.cf smtpd_sender_restrictions = check_sender_access hash:/etc/postfix/sender_access smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/recipient_access (make sure these are the FIRST entry on the lines) # /etc/init.d/postfix restart |
Categories: How-To's, Technology Tags: Block, CentOS, Email, howto, PostFix, Receiver, Reject, Sender, Spam, tips
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Author:
erics, December 17th, 2010
Edit /etc/postfix/access and add entries like: baduser@baddomain.com 550 No such user here Then run the following command: postmap /etc/postfix/access Edit /etc/postfix/main.cf: smtpd_recipient_restrictions = check_recipient_access hash:/etc/postfix/access, {any other options already there…} Then run the following command: postfix reload
Categories: How-To's, Technology Tags: Access, Email, main.cf, PostFix, Postmap, postmap access, Reject, Reject Email
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