Hi there,
I've observed a strange problem with Exim 4.10 that I can't explain myself:
2002-08-12 18:19:41 17eHuq-00042A-00 <= John.Doe@???
H=xxxern.informatik.some-uni.de (xxxi45.informatik.some-uni.de)
[aaa.bbb.34.45]:42587 I=[aaa.bbb.28.10]:25 U=root P=esmtp S=1781
id=0057440027592879000002L492*@MHS T="Beauftragung" from
<John.Doe@???> for our.user@???
2002-08-12 18:20:11 17eHuq-00042A-00 ** our.user@???
F=<John.Doe@???> R=amavis T=amavis: SMTP error from
remote mailer after end of data: host localhost [127.0.0.1]: 550 Rejected
by MTA: 550 Sender verify failed, id=15495-04
2002-08-12 18:20:11 17eHuq-00042A-00 Completed
2002-08-12 18:20:11 17eHvP-00042x-00 <= <> R=17eHuq-00042A-00 U=mail P=local
S=2751 T="Mail delivery failed: returning message to sender" from <> for
John.Doe@???
2002-08-12 18:20:11 17eHvP-00042x-00 ** John.Doe@???
<John.Doe@???> F=<>: all relevant MX records point to
non-existent hosts
2002-08-12 18:20:11 17eHvP-00042x-00 Frozen (delivery error message)
According to Exim "all relevant MX records point to non-existent hosts," which
is wrong, of course:
WWW:~# mx daimlerchrysler.com
daimlerchrysler.com MX 10 fxshpr07.extra.daimlerchrysler.com
daimlerchrysler.com MX 10 fxodpr12.extra.daimlerchrysler.com
WWW:~# host fxshpr07.extra.daimlerchrysler.com
fxshpr07.extra.daimlerchrysler.com A 129.9.80.164
WWW:~# host fxodpr12.extra.daimlerchrysler.com
fxodpr12.extra.daimlerchrysler.com A 129.9.82.72
WWW:~# telnet 129.9.82.72 25
Trying 129.9.82.72...
Connected to 129.9.82.72.
Escape character is '^]'.
220 fwodpr12.is.chrysler.com SMTP Ready.
quit
221 Closing connection
Connection closed by foreign host.
WWW:~# telnet 129.9.80.164 25
Trying 129.9.80.164...
Connected to 129.9.80.164.
Escape character is '^]'.
220 fwshpr07.is.chrysler.com SMTP Ready.
quit
221 Closing connection
Connection closed by foreign host.
**BUT**
WWW:~# ping 129.9.80.164
PING 129.9.80.164 (129.9.80.164): 56 data bytes
--- 129.9.80.164 ping statistics ---
10 packets transmitted, 0 packets received, 100% packet loss
WWW:~# ping 129.9.82.72
PING 129.9.82.72 (129.9.82.72): 56 data bytes
--- 129.9.82.72 ping statistics ---
4 packets transmitted, 0 packets received, 100% packet loss
Could this be the problem? To my knowledge it's a violation of certain
applicable RFC's NOT to return an ICMP echo request, but would Exim treat an
MX as invalid because of this?!
I can be pretty sure that we didn't have a temporary nameserver failure at
that time because other mail activity was fine at that time.
Thanks for any insights,
Ralf
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