Hello list!
I have set up a dual postfix configuration: one cloud server and one
server on-premises. The split:
cloud-instance (metered):
- exposed to the hostile environment
- does quick/basic/low-effort filtering (blocks at the firewall IP
ranges from which I do not expect anything of value; and does basic
sanity checks)
- tunnels the messages to the on-premises instance
on-premises (unmetered):
- check for existence of alias / mailbox
- fancy anti-spam filtering (local AI)
- delivery to mailbox (hosted within the trusted perimeter)
It works well. Almost all spam goes to /dev/null or equivalent.
HOWEVER, it could do better on a specific use case:
some large senders commingle spam with ham. the message passes the
cloud-instance because I cannot hard-block google, microsoft,
salesforce, etc. and they only get qualified as spam on the on-premises
instance. so my cloud instance gives them a 2yz while I would like to
give them a 5yz to inform big tech that they are being abused.
Is there a way to configure the cloud instance:
- to wait for the receipt of a return code from the on-premises instance
- and to return that code to the sender?
Thanks,
Yuv
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