Hi,
In my previous question [1] Viktor Dukhovni suggested
> you could use a policy service to impose rate limits per SASL login, or
sender address
as a means of preventing active queue congestion.
This took me down a bit of a rabbit hole looking at SMTP Access Policy
delegation and tcp_tables. However I have not managed to find much
(ANY???!!!) information on what the server responses should look like.
Although I don't yet know exactly what they look like, I have only seen
mention of accepting or rejecting emails at submission using SMTP Access
Policy delegation.
I really want to be able to generate, on a per message basis, the
behaviours that I currently have statically defined in a transport map.
These are:
(condition1) customtransport:
(condition2) smtp:[othernode]
Is this possible with either mechanism? What would the specific responses
be?
There is also a secondary issue: I'm trying to do load balancing here, but
the load balancing would be non-deterministic. I don't want the messages to
bounce around between nodes. While I could handle that based on the
helo_from= in SMTP Access Policy delegation, I don't believe this
information is available in tcp_tables. Assuming that the custom transport
is possible via tcp_table but NOT SMTP Access Policy delegation, how can I
ensure that a message only gets bumped to a peer once?
TIA
Colin
[1] https://www.mail-archive.com/postfix-users@postfix.org/msg101676.html
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