Jeff Peng via Postfix-users:
> Hello
> 
> I saw gmx.de/web.de have a policy that, if the submission IP is not from 
> DE/EU, messages will be routed to a different gateway which is listed in 
> spamhaus already. Otherwise if submission client's IP is in DE/EU, 
> messages will be routed out via the normal gateway whose IP is clean. 
> How to customized my own transport for that?

You can configure customized SMTP clients in master.cf, each with
an appropriate smtp_bind_address setting, and use transport_maps
to choose between those clients.

References:
https://www.postfix.org/postconf.5.html#smtp_bind_address
https://www.postfix.org/transport.5.html

AI is an experimental feature of this mailing list.

        Wietse
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