Thanks Jeremy Sounds like ACL is likely to be the right place for this - but I have about a hundred lists some of which have an Allow file and it isn’t a separate domain to our mailboxes… seems complex…
Honestly I never really looked at ACLs I just use the defaults and write new routers when I want new functionality ;) I probably have some reading ahead of me! Merlin -- Merlin Hartley Computer Officer MRC Mitochondrial Biology Unit University of Cambridge Cambridge, CB2 0XY United Kingdom > On 11 Jan 2018, at 12:36, Jeremy Harris <j...@wizmail.org> wrote: > > On 11/01/18 12:14, Merlin Hartley wrote: >> We use a simple list system (that I wrote a few years ago) which pulls data >> out of our HR database and creates files containing e-mail addresses (router >> described below) - which has an option to restrict the senders for >> submission to the list. >> When a message is from an authorised sender it is delivered to the list - >> when the sender is not on the Allow list the message drops through to the >> next router and therefore ends up at the last router which has a >> ‘cannot_route_message’. >> >> So far this sounds fine, the problem occurs when an intermediate MTA (e.g. >> our edge servers which I don’t control) tries to deliver a message with an >> unauthorised sender - this failure is then cached and no more messages to >> that list are accepted (even with authorised senders). >> >> I expect I should be checking the senders in a different way and giving a >> different response code in cases where the sender is unauthorised - so that >> intermediate MTAs don’t cache the result for this recipient… >> >> Does anyone have any pointers for me? > > I assume you're doing recipient verify, from the RCPT ACL - although the > router call is then checking the sender - so the intermediate MTA is > getting an SMTP-time rejection for the RCPT TO... which is your ML > submission address. As opposed to doing an accept-and-bounce. > > Could you reject in the MAIL ACL instead? > -- > Cheers, > Jeremy > > -- > ## List details at https://lists.exim.org/mailman/listinfo/exim-users > ## Exim details at http://www.exim.org/ > ## Please use the Wiki with this list - http://wiki.exim.org/ -- ## List details at https://lists.exim.org/mailman/listinfo/exim-users ## Exim details at http://www.exim.org/ ## Please use the Wiki with this list - http://wiki.exim.org/
