Felix Schwarz <[email protected]> (Sa 01 Okt 2016 22:06:04 CEST):
> Hi,
> 
> I have a backend system which might not be available sometimes. Usually I can
> forward my messages from Exim directly with SMTP but sometimes this will fail.
> Currently Exim just puts the message in a queue and applies the regular 
> timeouts.
> 
> Ideally I'd prefer if Exim could place a message to a local maildir in case of
> a delivery failure (so the backend system would fetch these later using 
> IMAP/POP).

Can't you use something like

backend:
    driver = …
    condition = ${if first_delivery}
    …

fallback:
    driver = …
    …

(Probably a fallback_transport would be good, but currently it doesn't
exist.)

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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