Re: [Exim] Verisign pulls a fast one

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Auteur: Philip Hazel
Datum:  
Aan: Walt Reed
CC: Joe Doehler, exim-users
Onderwerp: Re: [Exim] Verisign pulls a fast one
On Wed, 17 Sep 2003, Walt Reed wrote:

> Many mail servers fall back to the A record when no MX exists.


I have been saying for many years that it was time this old backwards
compability rule, which dates from the introduction of MX records, was
abolished. Certainly since before I started to write Exim, because I
patched an appropriate per-domain option into Smail.

> BTW, anyone have an ACL that rejects mail when the sender envelope
> domain does not have a valid MX record?


You can do this by making use of the mx_domains option on a dnslookup
router that you set up for use when verifying senders (check out the
verify_only and verify_sender options).

--
Philip Hazel            University of Cambridge Computing Service,
ph10@???      Cambridge, England. Phone: +44 1223 334714.
Get the Exim 4 book:    http://www.uit.co.uk/exim-book