Vicente Aguilar wrote: > Hi people. > > We're stuck on an strange situation when sending mails to a particular > domain: > > [...] > > - by inspecting their DNS records, I get this: > > host -t MX subdomain.domainA.com > subdomain.domainA.com is an alias for mail.domainB.com. > > dig MX subdomain.domainA.com > > ;; QUESTION SECTION: > ;subdomain.domainA.com. IN MX > > ;; ANSWER SECTION: > subdomain.domainA.com. 75256 IN CNAME mail.domainB.com.
There's the problem. I quote from the DNS HOWTO [1]: "CNAME record usage is a bit controversial. But it's safe to follow the rule that a MX, CNAME or SOA record should never refer to a CNAME record, they should only refer to something with an A record (...)" So I suggest you change your DNS setup and see if the problem goes away. Philipp [1] http://www.tldp.org/HOWTO/DNS-HOWTO-5.html#ss5.2
