System Admin: Undeliverable mail (postfix + SpamAssassin)

[Saman]

If you get an error as below with postfix when you try to send an email, here is the solution to fix that.

Your message did not reach some or all of the intended recipients.
Subject: Your Subject
Sent: 05/10/2010 5:49 PM
The following recipient(s) cannot be reached:
'[email protected]' on 05/10/2010 5:49 PM
554 5.7.1 Service unavailable; Client host [xxx.xxx.xxx.xxx] blocked using zen.spamhaus.org; http://www.spamhaus.org/query/bl?ip=xxx.xxx.xxx.xxx

Cause
Misconfiguration in Postfix (/etc/postfix/main.cf) for smtpd_client_restrictions setting.
You can read the current configuration using following command.

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postconf -n

Solution

1. Open Postfix config file

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   ex: vi /etc/postfix/main.cf

2. Find smtpd_client_restrictions which is almost at the end of the file.
3. Add permit_sasl_authenticated at the beginning of the setting
   ex: smtpd_client_restrictions = permit_sasl_authenticated, reject_rbl_client sbl-xbl.spamhaus.org, reject_rbl_client bl.spamcop.net

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   if you use vim editor, Press i to start inserting text

4. Save file

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   if you use vim editor, Press :w to save and then :q to exit

5. Restart Postfix

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   /sbin/service postfix restart

Good luck!