You cannot force any other party to apply YOUR policy to THEIR systems.
"Your server your rules, but my server my rules" :-)
Furthermore mandatory tls can fail for a bunch of other reasons except
from "not offering tls at all" ex no common cipher/tls version can be
I do mandatory tls on my servers too, but not globally. Just for
selected rcpt-domains/next-hops



Am 02.02.2018 um 09:36 schrieb Peter Keel:
> Hi
> I get these errors: 
> | TLS is required, but was not offered by host[]
> and 
> | TLS is required, but was not offered by host[]
> Since I've made TLS for SMTP mandatory. The respective admins of these servers
> might want finally at least enable voluntary TLS; some of their customers 
> apparently would like to receive mails from my server.
> And by the way, RFC 2487 that is referred to for instance in the postfix 
> manpage
> and stated that one must not make TLS mandatory has been obsoleted by RFC 
> 3207.
> Cheers
> Seegras

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