On 06/27/2018 07:14 PM, Richard Pieri wrote:
On 6/27/2018 7:05 PM, [email protected] wrote:
I've noticed when e-mail comes into a Comcast address, the sending mail
server (Yahoo/AOL (when it works), Gmail, mail.com, GMX, etc.), the
receiving Comcast server receives it with SMTP. But when Comcast sends
an e-mail out to one of these services, it sends with ESMTPS (secure).
Why secure connections one-way and not both directions?
My WAG? Comcast are logging all connections as SMTP regardless of
encryption.
I have also noticed when sending through Yahoo/AOL (again, when it
works), even though the Thunderbird settings are set to use SSL or
STARTTLS, the receiving Yahoo server always receives it with SMTP.
Server mis-configuration there?
If Thunderbird is configured to use SSL/TLS for a given account or
outgoing mail server then the connections are always encrypted. Always.
STARTTLS is opportunistic so connections might or might not be encrypted.
Received: from sonic301-4.consmr.mail.bf2.yahoo.com ([74.6.129.43]) by
resimta-ch2-15v.sys.comcast.net with SMTP
Received: from mail-qt0-x233.google.com ([IPv6:2607:f8b0:400d:c0d::233])
by resimta-po-04v.sys.comcast.net with SMTP
Received: from (mobile IP address removed) by
resomta-po-16v.sys.comcast.net with ESMTPSA
(This last one, was Comcast-to-Comcast, SSL both ways in the settings.)
So yes, it appears that Comcast is logging all inbound connections
coming from outside as SMTP.
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