On 2021-11-19, russellbell--- via Exim-users <[email protected]> wrote:

>       'IP addresses are not domain names. 
>       Yes.  I meant to say that it's a valid address.

ok

>       'They can not have MX records.'
>       Why not?  If an SMTP server at the address handles mail...

then it dosn't need an MX record.

>       'If there is any domain name that has an A record pointing to
> 123.456.789.012, it is likely to work much more often than using the
> IP address directly, even if it has no MX record.'

>       There is an A record, but there's also an MX record that
> points to our mail server, a Microsoft Outlook thing: mail sent to it
> won't arrive at the target server.

one way to avoid the need for ip literals is to make another MX record
(on a sub-domain) that points to the A record for this IP

>       Quoth Jasen Betts: 'You probably need to configure
> [123.456.789.012] as one of the domains that exim accepts for.
>       In host_accept_relay ?

could be local_domains (depending on how different your config is)

>       'you may need to enable IP literal domains too.'
>       Does local_domains_include_host_literals do this?

Exim documetation says: allow_domain_literals, I don't know where that
one comes from.

-- 
  Jasen.

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