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 :: Mailing Lists

[ILUG] MX record question

[ILUG] MX record question

Thomas Bridge thomas.bridge at via-net-works.ie
Wed Mar 29 14:48:04 IST 2000


On Wed, 29 Mar 2000 12:30:43 +0100, you wrote:

>Possibly but I don't know I am really just guessing here

>domain.com.             IN      A       190.x.x.x
>domain.com.             IN      MX      10 190.x.x.x
>*.domain.com.           IN      MX      10 190.x.x.x

However be very careful here as wildcards can have all sorts of
effects that you don't expect (eg: if your setup is the following:

example.com.		IN	A	192.168.100.1
mail.			IN	A	192.168.100.1
*.example.com.		IN	MX 5	mail.example.com.

This may not deliver mail to mail.example.com to mail.example.com as
it doesn't create an MX record for mail.example.com (it probably will
deliver the mail as most MTAs will fall back to the IP address that a
domainname resolves if it exists, but then think about the effect of
adding the following line to the zone file:

www.example.com.	IN	A	192.168.100.2

Paul Vixie who is the current maintainer of BIND recommends against
the use of wildcards.

T.





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