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Date: Tue, 16 Oct 2007 18:46:28 +0200
From: Magnus Hagander <magnus@hagander.net>
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To: "Marc G. Fournier" <scrappy@hub.org>
CC: Andrew Sullivan <ajs@crankycanuck.ca>,  pgsql-www@postgresql.org
Subject: Re: Mail setup broken (still/again?)
References: <20071016085209.GD22159@svr2.hagander.net>
	<20071016140750.GF3255@crankycanuck.ca>
	<3509D6C66029EDED469CF3C0@ganymede.hub.org>
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Marc G. Fournier wrote:
> 
> 
> --On Tuesday, October 16, 2007 10:07:50 -0400 Andrew Sullivan 
> <ajs@crankycanuck.ca> wrote:
> 
>> On Tue, Oct 16, 2007 at 10:52:09AM +0200, Magnus Hagander wrote:
>>> 1) Tries to deliver to svr1.postgresql.org. This machine response that the
>>> user is unknown, *but does so with a 450 error code indicating that this
>>> is a temporary error*. This is of course wrong, it should be responding
>>> with 550.
>> This does appear to be an error.
> 
> Changed ... postfix's default is 550, but we had:

Great.


> unknown_local_recipient_reject_code = 450
> 
> Funny thing is, looking on google, this isn't that particularly unusual:
<snip>
Yeah, IIRC there was a recommendation when this feature was added to
postfix that you do this. And it is a good recommendation - you just
have to remember to switch it back to 550 when you've tested :-) (yes,
I've forgotten that on my servers as well a couple of times)

>> Nit: it's not an alias; if it were (i.e. a CNAME or probably a
>> DNAME), it would be an error, because MX records can't point to
>> CNAMEs.  It's just another name for the same address, which is
>> perfectly acceptable.  It does seem a little baroque.
> 
> Fixed, now MX 0 == mail.postgresql.org, also an A record ...

Good.


>>> 2c) mx3 is then *graylisted* by svr1. A backup MX must *NOT* be graylisted
>>> by the primary machine. I know I have mentioned this several times before
>>> wrt other machines.
>> Absolutely.
> 
> Fixed ... I had missed the mx3 IP in the mynetworks file on postgresql.org ... 
> the other 3 mx servers should never have been affected, only the offsite one ...

Ah, that's why it reappeared.


Thanks for the quick fixes!

//Magnus