Hmm, is all this to say what I have in mind cannot be done within Exim? On Wed, Jan 21, 2015 at 6:31 AM, Ted Cooper <[email protected]> wrote:
> As Klaus said, it is perfectly valid for any domain to not have MX > records - instead it relies on the A fallback for email deliveries. > > Many versions of Exchange will also try the A fallback, regardless of > the existence of MX RR, when all specified MX servers defer. This should > be considered a bug, but it must also be compensated for. > > In the RFCs the A fallback is called "an implicit MX RR, with preference > of 0, pointing to that host." (RFC 5321) > > When the MX RR would just be duplication of the A RR, some admins don't > see the need to add MX explicitly. > > On 21/01/15 22:13, John Schmerold wrote: > > We have had various troubles with sender verify, however I am not sure > that > > any of my users would care to receive messages from a domain without some > > basic means of receiving a reply. At this point, I am not considering > > whether the mx record is valid, but I would like to block domains without > > one. The RBLs are strugling to keep up with all the random "innovative" > > domains, this seems to be a good tool in the anti-spam arsenal. > > > > > > On Wed, Jan 21, 2015 at 5:30 AM, Jeremy Harris <[email protected]> wrote: > > > >> On 21/01/15 11:18, Klaus Ethgen wrote: > >>> There are many legit senders without MX > >>> record. That is fully ok and there are mail admins out there that do > not > >>> see any reason why to add A and MX with the same content. > >> > >> How do they receive bounces? > >> -- > >> Jeremy > >> > >> > >> -- > >> ## List details at https://lists.exim.org/mailman/listinfo/exim-users > >> ## Exim details at http://www.exim.org/ > >> ## Please use the Wiki with this list - http://wiki.exim.org/ > >> > > > -- > ## List details at https://lists.exim.org/mailman/listinfo/exim-users > ## Exim details at http://www.exim.org/ > ## Please use the Wiki with this list - http://wiki.exim.org/ > -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
