Hi,
Two things can be true at the same time.
The OP did not say that you will never have deferrals once you turn on STARTTLS.
He said that he had deferrals without STARTTLS that went away with STARTTLS.
It is definitely possible that STARTTLS influences behaviours and
limits, just as IPv4 vs
We use an MTA which supports STARTTLS, sending the message data
through an encrypted channel for servers which support it (like
Google).
Thank you for enabling opportunistic STARTTLS - you've stepped up the
game for both yourself and possible clients. However, it is not
something that will
I read that they were able to redirect the traffic to their own machine,
and therefore perform an http-01 challenge like anyone else.
Which can effectively be mitigated by using DNSSEC, DANE and CAA.
Browser support for DANE is currently rather poor, but most MTAs and
MUAs support it out of
