Re: [Exim] relay_domains and verify = recipient

> This would work. You would have to be informed of any changes to the
> users on the other domain. To get around this you can use a callout
> when you verify the recipient. Any time an address comes in, it checks
> with the real receiving MTA (exim I hope) to see if the address is
> valid. Check out:
>
> Please note that you will either have to play with DNS to get your
> server to see your customers' server as the primary MX, but the rest of
> the world see yours as the primary MX, OR setup a manual route with
> verify for callouts to work for you.

He can use a manualroute router for that domain. No DNS tricks required.

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