I have read and re-read the documentation regarding transport(5) here: https://www.postfix.org/transport.5.html
First, the docs for things like say "sender_dependent_relayhost_maps" say: "This information is overruled with... the transport(5) table." but what the heck is "the transport(5) table"? Looking at the transport(5) docs there is not a single table!!? Then, in transport(5) the doc for "relay_transport" says "This is the default for remote delivery to domains listed with relay_domains. In order of decreasing precedence, the nexthop destination is taken from relay_transport, sender_dependent_relayhost_maps, relayhost, or from the recipient domain." But "sender_dependent_relayhost_maps" indicates that it can be overruled by "sender_dependent_default_transport_maps" so there is apparently some relationship between relay_transport and default_transport or at least between the sender_dependent files amongst themselves????? The transport(5) docs contain examples that indicate domains are searched without the @ sign, but in other places and in examples I find online it appears the @ sign is included in the sender_dependent...* searches??!! Ultimately, I cannot get postfix to honor "discard" filters I've created. My setup involves an inbound mail relay running postfix that relays via smtp to the domains it accepts for. relay_domains = domain1.com domain2.com domain3.com transport_maps = hash:/etc/postfix/transport sender_dependent_relayhost_maps = hash:/etc/postfix/sender_transport_maps the /etc/postfix/transport map contains entries for each of the domain1.com etc.: domain1.com smtp:[domain1.mail.handler.com]:2000 domain2.com smtp:[domain2.mail.handler.com]:2020 etc... the sender_transport_maps contains: @filtered_domain.com DISCARD I of course update the .db files with postmap and postfix start/stop between changes. However, mail from users at @filtered_domain.com still gets through! I've tried with and without the @. I've tried setting sender_dependent_default_transport_maps instead. I've tried everything I can think of. There seems to be no easy way to test this except to send examples via some other working domain and during the time I'm running tests all mail for that other domain might end up blocked. If there's an easier way to test whether mail from a certain domain will successfully get blocked that'd be great. I have DKIM and other filters enabled so it's not straight-forward to spoof MAIL FROM. Or maybe it is and I don't know the trick... heeeeelp :) Thanks in advance.
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