On Tue, 7 Apr 2020, Jeremy Harris via Exim-users wrote:
> On 07/04/2020 19:43, Linda Pagillo via Exim-users wrote:
>> set up Exim as a backup MX server for the
>> Windows servers.
>
> Preferably you need to have the backup know what the legitimate
> email accounts are - both local-part and domain - so that it
> can reject bad ones at SMTP time. Otherwise it becomes a source
> of backscatter (and, while I think of it, please do ensure that
> your primary does the same. It's not the default Exchange
> configuration; they do accept-then bounce as standard).
>
> Getting that knowlege depends on your existing setup.
> Possibly it's a case of pointing Exim at your AD server,
> and hoping it really does talk LDAP sanely.
Exim does recipient callouts and cutthrough delivery.
Are either of these useful for an MX backup ?
I have to admit most of the people I know have an exim server in front of
their exchange system rather than as an MX backup.
--
Andrew C. Aitchison Kendal, UK
andrew@???
