Dear exim users,
what special measures do you take on forwarding addresses to prevent backscatter?
We have quite a lot of addresses that forward mail to dozens of recipients. Unfortunately it happens quite often that the servers for addresses we forward to reject the mail for some reason.
It would be nice if one could, after the DATA has been given on the incoming connection, try to forward the mail to the downstream servers and answer the DATA command with the result we got ourselves.
However I doubt this is possible, especially if forwarding to more than one address? How to handle different results (one downstream server accepts, one rejects) in this case?
A simple recipient callout does not suffice if the address we forward to is valid but the server rejects the mail based on content.
Thanks for sharing your thoughts :)
Kind regards
Matthias
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