[ILUG] MX record question

[Lars Hecking]

Justin MacCarthy writes:
> Sorry I wasn't clear !!!  What I meant was a catchall. IE How do I get mail
> sent to anything.dom.net  to go to mail.dom.net
 
 One way is using a wildcard MX record. That's generally perceived a bad idea. 
 http://www.sendmail.org/faq/section4.html#4.1
 DNS&BIND 3rd ed p.378
 The latter doesn't actuall say it's a bad idea, only that it's dangerous :)

 Alternatives:

 o sendmail: mailertable; FEATURE(`mailertable')

   entry:

     .dom.net	smtp:[mail.dom.net]

   The brackets turn off MX lookups.

 o postfix: transport table; transport_maps = hash:/etc/postfix/transport

   entry:

     .dom.net	:[mail.dom.net]

   As the default transport is smtp, it can be omitted (the part before the
   colon on the RHS). The brackets turn off MX lookups.


John McCormac writes:
> Justin MacCarthy wrote:
[...] 
> Set up mail.dom.net with its own IP.
> Then set the MX for dom.net to mail.dom.net. This should work by
> default. Then it is up to the Sendmail/MTA to decide what goes where.

 But this doesn't work.

 If there are no MX records for anything.dom.net, mail will be sent to
 anything.dom.net directly (ie. the A record), and not to mail.dom.net.