Re: [Exim] sender_verify

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Author: Ralf G. R. Bergs
Date:  
To: exim list
Subject: Re: [Exim] sender_verify
[quote repaired]

On Thu, 18 Jul 2002 17:52:40 +0530, maillist wrote:

>>I have exim 3.36 installed on RH Linux 7.2. Recently I have enabled
>>sender_verify option which rejects mail if the A record of sender domain
>doesn't
>>exist.So, if say user@??? try to send mail to me my mail server will
>reject
>>mail as there is no A record for exim.org.
>
>I don't know who told you so, but this is nonsense.
>
>It checks for a valid MX record, of course. Anything else would be nonsense

as
>well.

[...]
>exim_rejectlog:
>
>2002-07-11 11:34:35 17SbHP-00064h-00 rejected from he102war.uk.vianw.net
>[195.102.249.209]: cannot route to sender <post@???>
>
>there is no valid A record for mfaqs.co.uk but, has valid MX record:
>
>mfaqs.co.uk     preference = 20, mail exchanger = mserv1.u-net.net
>mfaqs.co.uk     preference = 10, mail exchanger = mserv0.u-net.net


So what?! Is *this* proof for my statement being wrong?! No, it's NOT.

Exim's above error message can have a thousands of reasons -- we don't know
why he102war rejects your message. It's NOT a problem with the mfaqs.co.uk
domain:

Server:~$ host -t mx mfaqs.co.uk
mfaqs.co.uk             MX      20 mserv1.u-net.net
mfaqs.co.uk             MX      10 mserv0.u-net.net


Server:~$ telnet mserv0.u-net.net 25
Trying 195.102.249.132...
Connected to mail.uk.vianw.net.
Escape character is '^]'.
220 he101war.uk.vianw.net ESMTP Exim 4.04 Thu, 18 Jul 2002 14:42:08 +0100
helo blah
250 he101war.uk.vianw.net Hello blah [137.226.80.218]
mail from:<mailtolist@???>
250 OK
rcpt to:<post@???>
250 Accepted
quit
221 he101war.uk.vianw.net closing connection
Connection closed by foreign host.

So there -- as you see mail to that address CAN be delivered.

As some very smart guys mentioned the A RR *is* used, but only if there aren't
any valid MX RRs (which isn't the case in your example so I didn't mention
it.)

Make sure that both your IP routing and Exim's mail routing is ok.


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