As this is the exim list I'll keep this part short, but what we do is
relay from our exim boxes out to ZoneMTA for the kind of behavior you
are wanting. To truly handle it properly you need proper context for
every bounce message and that means not only having a huge list of
errors to treat differently, but also being able to adapt as new ones
appear quite regularly. That kind of behavior is really not best handled
by hammering any particular configuration on top of exim, it would
ideally either be a very large and specific project for exim devs or
simply delegated to software that has a more directed focus on something
like that. I suspect the latter is always going to be the best path.
On 2024-03-07 11:10, Patrik Peng via Exim-users wrote:
> Hi
>
> For situations where an IP is blocked or rate limited, we would like to
> automatically try to send the mail via an alternate interface.
>
> The following configuration achieves the desired result.
> If a mail is queued for more than 5 minutes, it will be sent from a
> different source IP.
>
> remote_smtp:
> driver = smtp
> interface = ${if <{300}{${eval:$tod_epoch - $received_time}}{<;
> $FALLBACK_IPV4; $FALLBACK_IPV6}{<; $DEFAULT_IPV4; $DEFAULT_IPV6}}
>
> While the mail can be sent on a second try, the retry database does not
> reflect this:
>
> Transport: mx1.host.net [123.123.123.123/NULL] error 60: Operation
> timed out
> first failed: 07-Mar-2024 12:01:28
> last tried: 07-Mar-2024 17:13:06
> next try at: 07-Mar-2024 18:43:06
> Transport: mx2.host.net [123.123.123.124/NULL] error 60: Operation
> timed out
> first failed: 07-Mar-2024 12:01:06
> last tried: 07-Mar-2024 15:45:22
> next try at: 07-Mar-2024 17:15:22
>
> After a while (past the final cutoff time), this causes mails to these
> hosts to be bounced immediately (as documented).
>
> Is there another way to retry sending mails from a different source
> interface while maintaining correct retry db entries?
>
> Kind regards,
> Patrik
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