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<p dir="auto">Thanks, Martin. Yes, this seems to be a problem. Many places seem to be OK with just looking up <code style="background-color:#F7F7F7; border-radius:3px; margin:0; padding:0 0.4em" bgcolor="#F7F7F7">sift.net</code>, but cl.net is one of a handful that won't accept that and need the mail address to line up exactly with <code style="background-color:#F7F7F7; border-radius:3px; margin:0; padding:0 0.4em" bgcolor="#F7F7F7">mail.sift.net</code>.</p>
<p dir="auto">I've reported this to our sysadmins and they are trying to figure out a solution.</p>
<p dir="auto">On 22 Jul 2020, at 5:44, Martin Simmons wrote:</p>
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<div style="white-space:normal"><blockquote style="border-left:2px solid #777; color:#777; margin:0 0 5px; padding-left:5px"><blockquote style="border-left:2px solid #777; color:#999; margin:0 0 5px; padding-left:5px; border-left-color:#999"><blockquote style="border-left:2px solid #777; color:#BBB; margin:0 0 5px; padding-left:5px; border-left-color:#BBB"><blockquote style="border-left:2px solid #777; color:#BBB; margin:0 0 5px; padding-left:5px; border-left-color:#BBB"><blockquote style="border-left:2px solid #777; color:#BBB; margin:0 0 5px; padding-left:5px; border-left-color:#BBB"><blockquote style="border-left:2px solid #777; color:#BBB; margin:0 0 5px; padding-left:5px; border-left-color:#BBB"><p dir="auto">On Wed, 15 Jul 2020 11:22:51 -0500, Robert Goldman said:</p>
</blockquote></blockquote></blockquote></blockquote><p dir="auto">By the way, this is not my normal email, but emails from my work address<br>
(rpgoldman@sift.net) are being bounced because of the reverse lookup<br>
policy on common-lisp.net.<br>
<br>
It seems to be puking on this:<br>
<br>
Your IP address 50.249.120.161 is associated with the domain sift.net.<br>
Nevertheless your message appears to be sent from mail.sift.net.</p>
</blockquote><p dir="auto">I think SIFT has misconfigured reverse DNS:<br>
<br>
# host -t a mail.sift.net.<br>
mail.sift.net has address 50.249.120.161<br>
# host -t a 50.249.120.161<br>
161.120.249.50.in-addr.arpa domain name pointer sift.net.<br>
# host -t a sift.net.<br>
sift.net has address 50.249.120.162<br>
<br>
The reverse DNS for 50.249.120.161 should be mail.sift.net. for best practice<br>
(see <a href="https://www.debouncer.com/reverse-dns-check?ip=50.249.120.161" style="color:#777">https://www.debouncer.com/reverse-dns-check?ip=50.249.120.161</a>).<br>
<br>
__Martin</p>
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