<div dir="ltr">rfc5321 section 5 indicates that Sendmail <i>should</i> try the server(s) to whom the alternative MX records point. It shouldn't try all multihomed A records pointed to by a single MX record (although, that's not exactly what the RFC says) but that's not the case here. So the question still is, why doesn't Sendmail try the alternative MX records?<br>
<div class="gmail_extra"><br><br><div class="gmail_quote">On 2 September 2014 14:39, Peter Farrow <span dir="ltr"><<a href="mailto:peter@farrows.org" target="_blank">peter@farrows.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
If the primary MX does not resolve , sendmail will not try a lesser
MX record, because the best option is unresolvable, so it will
return the message after checking and appending any search
parameters given in /etc/resolv.conf.<br>
<br>
This behaviour is by design, and you are trying to fix a problem
which is inherently not yours to solve.<br>
<br>
If the primary MX does not resolve : The domain is broken - so why
try and work around that?<div><div class="h5"><br>
<br>
<br>
<br>
<br>
<br>
<div>On 02/09/2014 13:19, <a href="mailto:ja@conviator.com" target="_blank">ja@conviator.com</a>
wrote:<br>
</div>
</div></div><blockquote type="cite"><div><div class="h5">
<div>hi</div>
<div> </div>
<div>its a bit OT but I hope its OK anyway. We are also using
Mailscanner as outbound scanner and see a problem that I cannot
figure out - probably some setting im missing. </div>
<div> </div>
<div>sometimes "we" send emails to a domain where the primary MX
record does not resolve. I would have expected that sendmail
would just try the next but instead it resolves to
<a href="http://mxrecord.name.OURDOMAIN.COM" target="_blank">mxrecord.name.OURDOMAIN.COM</a> (I think) - it seams it appends our
domain and then tries this server and this server says "no
thanks" so the delivery fails. </div>
<div> </div>
<div>I tried to lookup the MX myself using the same nameserver as
the mailscanner server is using - this fails so its not the DNS
server that appends something to make it resolveable or gives
out a standard IP. </div>
<div> </div>
<div>I also checked the resolve file to check that there is not
search setting that would make it search our domain for a valid
IP/lookup. </div>
<div> </div>
<div>how can I stop this behavior and make it try the next MX in
line? </div>
<div> </div>
<div>best regards</div>
<div>Jan</div>
<div> </div>
<br></div></div>
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