> The man page wasn't helpful for this.
>
> I'm going to be replacing our mail nodes over the next few weeks and
> I've been sequencing events in the move. It would be very handy if it were
> possible to tell one of my nodes to keep accepting mail but to stop trying
> to deliver it. Can this be done? If so, how? I suspect the answer is no,
> but I'll gladly be told otherwise.
This is entirely possible. You want a router that acts very early on and
looks something like this:
defer_user:
driver = redirect
allow_defer
data = :defer:delivery temporarily stalled
no_verify
no_expn
condition = ${if match_address{$local_part@$domain}{/etc/exim4/exim-addr-defer}}
Then at the appropriate time, add '*@*' to /etc/exim4/exim-addr-defer
and enjoy absolutely everything being stalled. Because this router is
set to no_verify, it will not stop a RCPT TO address being verified and
thus accepted. (Or even a MAIL FROM address.)
- cks
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