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Give a man a fire and he's warm for the day. But set fire to him and he's warm for the rest of his life. (Terry Pratchett)
Give a man a fish and he will eat for a day. Teach a man to be gay and he'll eat cocks for the rest of his life.
Give a man a fish, and he eats for a day. Give a man improperly prepared pufferfish, and he eats for the rest of his life.
Opera/9.80 (Series 60; Opera

Mini/7.1.32444/31.1395; U; en)

Presto/2.8.119 Version/11.10

Of course, there'll always be some mail servers that don't follow the RFCs properly.

Checking the logs, I noticed the following:

Sep 26 03:11:47 hosting postfix/smtpd[19263]: connect from[]
Sep 26 03:11:49 hosting postfix/smtpd[19263]: NOQUEUE: reject: RCPT from[]: 450 4.7.1 <>: Helo command rejected: Host not found; from=<> to=<a.user@a.domain> proto=ESMTP helo=<>
Sep 26 03:11:49 hosting postfix/smtpd[19263]: disconnect from[]

Now, according to the SMTP RFC (

The domain name given in the EHLO command MUST BE either a primary
host name (a domain name that resolves to an A RR) or, if the host
has no name, an address literal as described in section

So why isn't there a DNS entry for

Anyway, to allow these broken setups to skip the "reject_unknown_hostname" in "smtpd_helo_restrictions", (as I don't want to disable it - it catches 95% of the spam) - you need to do the following:
* In, add parent_domain_matches_subdomains = yes
* In the smtpd_helo_restrictions section, add "check_helo_access hash:/etc/postfix/helo_access"
* In that helo_access file, list the offending "HELO/EHLOs" - in this case: OK

* Finally, run postmap /etc/postfix/helo_access to build the DB file, and restart postfix.

It does appear to be a problem more with some mail server admins than others. (

Feed a man fish - and then he wants chips.
Give him chips and he asks for peas.
Why not cut out the fish, make him a vegetarian, and help restore the balance of cod in the North Sea ???

Give a man a fish, he'll eat for a day, give a man a fishing pole and he'll choke on it.
Give a man a fish he'll eat for an hour, give a man a wooden fish he'll be gnawing on it for a day.
Give a fish a man and it's probably JAWS!
Give a man eating fish in a restaurant pepper and it spices up the flavor, give a man eating fish some pepper in the sea and it spices up the you.
Give a man a dog and he can take it for a walk, give a man a fish he can take it for a drag.

give a man a poisoned fish and he will be fed for the rest of his life.
give a man a fish and you feed him for the day. Teach him how to fish you'll have to hear about the big one that got away fro the rest of your life
Give a man a fire and he's warm for a day. Set a man on fire and he's warm for the rest of his life!