[devtalk] New list bounces - suspected DNS problem

[David Precious]

Hi all,

After some investigation, I *think* I see what's going on.

The list posting address is devtalk at lists.preshweb.co.uk; however, of 
the bounce messages I've been forwarded, the posts were addressed to 
devtalk at lyla.preshweb.co.uk.

Now, I *think* this is a DNS configuration issue; it seems I don't have 
MX records for lists.preshweb.co.uk configured, lists.preshweb.co.uk is 
instead a CNAME to lyla.preshweb.co.uk (lyla being the name of the 
machine actually responsible for hosting lists.preshweb.co.uk).

Now, this seems sensible to me, and seems to work for me when I send 
from my own mail account or from Google Mail, and also works for some of 
you.

However, for others, it seems as though your client is seeing that 
lists.preshweb.co.uk is a CNAME to lyla.preshweb.co.uk, and silently 
re-addressing the mail to devtalk at lyla.preshweb.co.uk instead of 
devtalk at lists.preshweb.co.uk.

This behaviour seems wrong and retarded to me, but seems the only 
explanation I can find (except if you were actually addressing your 
messages to devtalk at lyla.preshweb.co.uk; however, checking the mails I 
sent out, the list info page, the list welcome email etc, I don't see 
that address listed *anywhere*, so it seems unlikely...

I'll investigate a bit further and see if I'm correct; if I am, I'll 
have to change lists.preshweb.co.uk from a CNAME to a straightforward A 
record, then create MX records too (DNS specs state that if a hostname 
is a CNAME, no other records for that hostname should exist).

I hate DNS :)

Cheers

Dave P