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:
header_checks = regexp : / etc / postfix / header_checks
Next, creaate or edit /etc/postfix/header_checks as root and add the following line:
/ 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 […]
How-To's , Technology Tags: Block , Check , Checks , Discard , Header , header_checks , headers , howto , PostFix , Reject , Spam , Subject , tips No comments
Author:
erics , December 29th, 2011
If the spam comes from an actual phone number you can report the number directly to AT&T… Tap and hold the body of the text message, then choose Copy. Create a new text message to 7726 (SPAM on the keypad). Paste in the spam message you just copied and send it.Note: Sending this message won’t […]
How-To's , Technology Tags: AT&T , howto , iphone , SMS , Spam , Text message , tips No comments
Author:
erics , June 3rd, 2011
By default, the Postfix SMTP server accepts any sender address. You block email addresses using the sender_access file:
# 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
How-To's , Technology Tags: Block , CentOS , Email , howto , PostFix , Receiver , Reject , Sender , Spam , tips 2 comments
erics, December 7th, 2021 
Categories: How-To's, Technology Block, Check, Checks, Discard, Header, header_checks, headers, howto, PostFix, Reject, Spam, Subject, tips
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