The advantage of using CNAMEs is contained in the message above - the MX resolution for mail.abc.net would be the same as for abc.net, so if the
you should never point MXs to CNAMEs - it is just not done, for a variety of reasons.
As Devdas suggested set up virtusertables.
MXs of abc.net change or are dynamic, then you don't need to go about updating your A records. This becomes particulary important when you are
You are confusing dynamic DNS with cnames, somehow.
And you really must not use dynamic IPs for your MX - at least if you value the fact that your email must reach you.
If you have poorly or intermittently connected hosts (dialup / isdn / dsl with dynamic IP), then use uucp - it is an old protocol but still quite useful. Run over tcp (and optionally, over ssh tunnels) it is quite reliable for what you need to do.
Try a "dig MX xo.com" at regular intervals and you'll see what I mean.
You are completely missing the point here.
Er..in the case of the OP, what particular advantage does this approach have over using the aliases file? Expect him having to do more work in setting up virtusertable support...
What extra work?
The solution I was looking for is kind of fallback relay that PostFix and Exim support. AFAIK, mailertable in sendmail won't do the job since that defines the routing for an entire domain.
FallbackMXHost (or confFALLBACK_HOST) is what you are thinking of.
But that still wont help you .. virtusertable is completely different and can provide the per user routing that you want.
And if you are using the virtusertable to route mail between poorly connected hosts and a central smarthost type system, you are far better off setting up the poorly connected hosts as uucp nodes and spooling mail for them.
srs
-- [EMAIL PROTECTED] (Suresh Ramasubramanian)
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