On Fri, Feb 05, 2021 at 02:58:09PM -0500, Wietse Venema wrote:
> For quota control, it is necessary to know EXACTLY what local user(s)
> will receive the email. That means EXACTLY processing canonical_maps,
> virtual_alias_maps, alias_maps and $HOME/.forward.
>
> So how would you propose for SMTPD to figure that out? I mentioned
> the idea of maintaining a cache with RCPT TO -> mailbox mappings.
If recipient address rewriting is on input (virtual alias maps rather
than on output (as with local(8) .forward, or local aliases(5)), then
one way is perhaps with recipient_address_verification probes and a
transport table that routes over-quota recipients to a an "error"
transport.
The list of over-quota users can be updated once an hour or similar
frequency.
--
Viktor.
