Re: [ALUG] More about sendmail sending to local machine

On Sun, Nov 11, 2007 at 11:46:04AM +0000, Chris G wrote:

I'm beginning to think this is impossible! :-)

...

Which certainly looks as if sendmail thinks that home.isbd.net is the local machine. However when I tried using 'mail' to send a message from root to chris@home.isbd.net (I used 'mail' to ensure little else was involved) it *still* tries to send it out to the outside world.

The entries in maillog are:-

Nov 11 11:38:20 home sendmail[7883]: lABBcJ9h007883: from=root, size=64, class=0, nrcpts=1, msgid=<200711111138.lABBcJ9h007883@home.isbd.net>, relay=root@localhost
Nov 11 11:38:20 home sendmail[7884]: lABBcKac007884: from=<root@home.isbd.net>, size=354, class=0, nrcpts=1, msgid=<200711111138.lABBcJ9h007883@home.isbd.net>, proto=ESMTP, daemon=MTA, relay=localhost.localdomain [127.0.0.1]
Nov 11 11:38:20 home sendmail[7883]: lABBcJ9h007883: to=chris@home.isbd.net, ctladdr=root (0/0), delay=00:00:01, xdelay=00:00:00, mailer=relay, pri=30064, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (lABBcKac007884 Message accepted for delivery)
Nov 11 11:40:20 home sendmail[7886]: lABBcKac007884: to=<chris@84-45-228-40.no-dns-yet.enta.net>, delay=00:02:00, xdelay=00:02:00, mailer=esmtp, pri=120354, relay=84-45-228-40.no-dns-yet.enta.net. [84.45.228.40], dsn=4.0.0, stat=Deferred: Connection timed out with 84-45-228-40.no-dns-yet.enta.net.

Looks like sendmail is finding the CNAME and rewriting the address. You shouldn't use a CNAME for a host that you want to receive mail. I suggest you try changing it to an A record instead. See, for example, RFC1123 Section 5.2.2

J.