Hi guys
TL;DR: how can i route, to a specific smarthost, all email based on
the *recipient* mx IP address ?
Long version:
I have a mail server hosted on Google Cloud that can't reach some
"restricted" countries, like Cuba, Iran, Syria and so on.
A customer of us, has a department located in Iran and is unable to
communicate to them, so i've started an AWS instance (that is able to
reach the remote iran server) and i would like to route, from my GCE
instance all email that should be routed to an iran IP address (i have
a list, downloaded from ipdeny.com), to my AWS instance.
I can check for the remote MX in the transport, but:
1. i'm getting a list of multiple hosts
2. i need to convert one (or more) of them to IP addresses
3. i need to check if at least one of these IP is inside a file
(automatically updated from ipdeny.com)
I don't know how to start.
Any help, or any better solution ? Checking the recipient TLD would be
much easier but not all recipients ends in ".in"
Currently, as workaround, i've set the AWS as fallback_host, because
when an email is routed to Iran, goes in timeout and then routed to
the fallback_host, but this is no good because is routing throuhg AWS
all emails that are triggering a timeout but I need to route *only*
emails to some ip addresses
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