Re: [exim] local_domains by dns

On Thu, Aug 26, 2021 at 02:26:27PM +0200, Cyborg via Exim-users wrote:
> This scenary is a  reallife problem in multi-domain hosting. If you only
> have a handfull of domain, most of them your property or under your admin
> control, you won't have it and will never have thought about it. With
> thousands of domains and external admins just switching mx entries as they
> like,

If somebody change MX to other host, he should think also how to handle
multiple mailboxes (hosted on "old" place and on "new" one),
and what to do with already stored mails.

> it gets a problem for all those on the server, who send mail to the
> switched domain. The users correctly assume, that the server will handle
> this situation.

There is no such problem if locally submitted mails are always relayed
via smarthost, even if they addressed to local users. To obey your scheme,
smarthost should use only MXes for routing.
--
Eugene Berdnikov