Re: [exim] Routing failed deliveries through an ESP

On 17 April 2023 03:08:29 Lance Lovette via Exim-users
<exim-users@???> wrote:
> How might I configure my routers to ignore an initial 5xx response from the
> first router and attempt another (and maybe future) deliveries through an
> alternate router?

I'm going to make the very obvious and morally correct answer: you don't.

If you get a 5xx error from the receiver's MX, you do the right thing and
abide by it. They're telling you they didn't want your message.

If you've got such a problem with IP or domain reputation that you end up
on DNSBLs with any frequency, you need to work on that rather than palming
off your messages to a third party.

That said: why not just send via the ESP in the first place?

Graeme