On 31/01/2022 12:38, James Elstone via Exim-users wrote:
> host 2.3.4.5 issues a [...] 5XX error,
That's definitive, if it is a response to RCPT. If you
are wanting your first system to spool even so, I think
you are trying to operate outside the spirit of SMTP.
But you didn't say what this possible 5XX might be
a response to.
I assume you've read
http://exim.org/exim-html-current/doc/html/spec_html/ch-retry_configuration.html
You might also look at
http://exim.org/exim-html-current/doc/html/spec_html/ch-exim_utilities.html#SECTfinindret
--
Cheers,
Jeremy