SSL verify error during R-verify and domain not resolve?

Richard G

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Joined
Jul 6, 2008
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Location
Maastricht
I'm was using an online system to check various email authentications.

It's possible to send a mail to: [email protected]
Then testmails should be created automatically, but I get every couple of days an email stating:
host email-test.had.dnsops.gov [129.6.100.206]
SMTP error from remote mail server after pipelined MAIL FROM:<[email protected]> SIZE=1806:
451 4.1.8 Domain of sender address [email protected] does not resolve:
retry timeout exceeded

Which is odd, because I'm using this domain already for years.

I just checked exim mainlog from juli 31st and see this, which I wonder if that has anything to do with it.
Code:
2018-07-31 02:52:39 1fkItz-0007Ir-Gn <= [email protected] H=541xxxxxx.cm-5-7b.dynamic.ziggo.nl (PC12) [84.30.xxx.xxx] P=esmtpsa X=
TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256 CV=no A=login:[email protected] S=757 [email protected] T="t
est" from <[email protected]> for [email protected]
2018-07-31 02:52:39 cwd=/var/spool/exim 3 args: /usr/sbin/exim -Mc 1fkItz-0007Ir-Gn
2018-07-31 02:52:40 1fkItz-0007Ir-Gn [129.6.100.206] SSL verify error: depth=0 error=self signed certificate cert=/C=US/ST=MD/L=Gait
hersburg/O=NIST/OU=HAD-pilot/CN=email-test.had.dnsops.gov/[email protected]
2018-07-31 02:52:40 1fkItz-0007Ir-Gn H=email-test.had.dnsops.gov [129.6.100.206]: SMTP error from remote mail server after pipelined
 MAIL FROM:<[email protected]> SIZE=1806: 451 4.1.8 Domain of sender address [email protected] does not resolve

On the first line you can see that H=xxxx is my personal home address with the ip of my isp. So I can understand why this would generate an SSL error.

However, to send mail somewhere I connect to the smtp of my server. Shouldn't the H= on the dnsops.gov server not be from my company's domain then?

But it seems the real problem is that the domain of sender address does not resolve. And that is strange because I already use this domain already for 10 years.
A check on ultratools shows that there is no problem at all resolving with the root servers.
So is this a dnsops.gov issue? Or is still something wrong on my side?
 
Same here i tested for you only ;)
This message was created automatically by mail delivery software.
A message that you sent has not yet been delivered to one or more of its
recipients after more than 24 hours on the queue on vp......

The message identifier is: 1fmDfc-0003fI-OT
The subject of the message is: Even testen van mail
The date of the message is: Sun, 5 Aug 2018 07:41:45 +0000

The address to which the message has not yet been delivered is:

[email protected]
host email-test.had.dnsops.gov [129.6.100.206]
Delay reason: SMTP error from remote mail server after pipelined MAIL FROM:<[email protected]> SIZE=6263:
451 4.1.8 Domain of sender address [email protected] does not resolve

No action is required on your part. Delivery attempts will continue for
some time, and this warning may be repeated at intervals if the message
remains undelivered. Eventually the mail delivery software will give up,
and when that happens, the message will be returned to you.
 
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