[Exim] Sender verification and A records

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Author: Marc Haber
Date:  
To: exim-users
Subject: [Exim] Sender verification and A records
|mh@q[1/501]:~$ telnet mailrelay.example.com 25
|Trying ip.ip.ip.ip...
|Connected to mailrelay.example.com.
|Escape character is '^]'.
|220 mailrelay.example.com ESMTP Exim 3.13 #1 Mon, 28 Feb 2000 16:49:51 +0100. Everything you do is logged, don't spam us or our customers.
|helo myhost
|250 mailrelay.example.com Hello mh at yourhost.example.com [ip.ip.ip.ip]
|mail from: <spamtest@???>
|250 warning: temporarily unable to resolve sender address: accepted unverified <spamtest@???>
|quit
|221 mailrelay.example.com closing connection
|Connection closed by foreign host.
|mh@q[2/502]:~$ host -t ANY mailrelay.example.com
|mailrelay.example.com    A       ip.ip.ip.ip
|mh@q[3/503]:~$


Obviously, sender address verification is done by doing MX lookup
only. Is there a reason why existence of an A record is not accepted
as verification for a sender?

Greetings
Marc

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