Cyborg <[email protected]> (Fr 01 Dez 2017 09:18:53 CET):
> Hi,
> 
> is there way to stop mail delivery to external servers if those servers
> do NOT offer STARTTLS ?

hosts_require_tls in the transport should do its job.
(It is an option specific to the SMTP transport.)
 
> A DB depended condition, when to check it, would be awesome.

    hosts_require_tls = ${ whatever lookup you want }

    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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