Patrick Porteous via Exim-users <exim-users@???> (Mi 09 Jun 2021 21:58:24 CEST):
> Hello,
>
> I would like to set up a filter to disable all external links in received
> messages. Can someone point me to where to to start looking into that type
> of filtering?
I wouldn't even think about manipulating the mail body. It is asking for
endless trouble. You won't be able to do it in a perfect way, signatures
will be broken, replies will contain dysfunctional links.
If you want to protect your users, restrict their access to external
resources (e.g. force them to use a proxy under your control).
Best regards from Dresden/Germany
Viele Grüße aus Dresden
Heiko Schlittermann
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