@lbutlr:
> Has anyone implemented geo based restrictions for postfix login =
> connections, or is this something that needs to be done in dovecot?

Accodring to a search engine, with seach terms "postfix geoip", there
are many solutions. One uses postfwd with a geoip plugin to block
SASL login from too many different countries.

https://www.howtoforge.com/tutorial/blocking-of-international-spam-botnets-postfix-plugin/

No idea how well it works.

> I was thinking someway to add most of Asia and Eastern Europe to =
> postscreen checks would be useful?

Postscreen does not implement SASL and that is a good idea.

        Wietse

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