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Old 10-23-2006, 09:33 AM   #1
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Registered: Oct 2006
Distribution: FC 3 and 4
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Question Postfix Require Helo Workaround

I use:
smtpd_helo_required = yes
Im my
The problem I have to let one through. Here is the log file currently:
Oct 22 04:09:10 mail postfix/smtpd[16202]: NOQUEUE: reject: RCPT from[]: 450 <>: Helo command rejected: Host not found; from=<> to=<> proto=ESMTP helo=<>
Oct 22 04:09:10 mail postfix/smtpd[16202]: disconnect from[]
So how can i set a rule above to allow "" to bybass the hello check.
Old 10-23-2006, 01:18 PM   #2
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You're probably getting blocked by the following rule in smtpd_helo_restrictions:

reject_unknown_helo_hostname (with Postfix < 2.3: reject_unknown_hostname)

Reject the request when the HELO or EHLO hostname has no DNS A or MX record.
The unknown_hostname_reject_code specifies the response code to rejected requests (default: 450).

You can either remove the rule from your or add check_helo_access hash:/etc/postfix/helo_access under smtpd_helo_restrictions and place it before reject_unknown_helo_hostname/reject_unknown_hostname. Then add the following to helo_access: OK

Then postmap helo_access and restart postfix. Now will skip all subsequent helo rule checks in smtpd_helo_restrictions but any checks before it will still be checked.
Old 10-23-2006, 01:30 PM   #3
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Thanx That makessome sense. Ill give it a shot.


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