On 2023-04-18 at 14:54:22 UTC-0400 (Wed, 19 Apr 2023 02:54:22 +0800)
tom--- via Postfix-users <t...@myposts.ovh>
is rumored to have said:

How to reject messages by languages?
For example, only English, Germany and Chinese messages will be accepted. All others should be rejected.

For that sort of filtering, you need to use an external tool such as ASF SpamAssassin or rspamd, usually integrated with Postfix via a milter interface.

Note that detection of specific languages in email is intrinsically imperfect.


--
Bill Cole
b...@scconsult.com or billc...@apache.org
(AKA @grumpybozo and many *@billmail.scconsult.com addresses)
Not Currently Available For Hire
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