said by ptb42:I am sure a lot of smaller mail servers haven't bothered to enable TLS. But, the big email providers, accounting for a very large portion of email address, have enabled TLS.
Probably among the smallest ISPs in the U.S.:
Received: from [192.168.102.222] (reki.aosake.net [173.228.7.217])
(authenticated bits=0)
by d.mail.sonic.net (8.14.4/8.14.4) with ESMTP id s3K2BnPK031067
(version=TLSv1/SSLv3 cipher=DHE-RSA-AES128-SHA bits=128 verify=NOT)
for <**********@pacbell.net>; Sat, 19 Apr 2014 19:11:50 -0700
Almost certainly the largest:
Received: from FamilyPC ([24.20.126.137])
by omta12.emeryville.ca.mail.comcast.net with comcast
id ALxH1n00D57wvhC8YLxHpy; Sun, 05 Jan 2014 20:57:18 +0000
I need to find out if my Comcast correspondent is using SSL, because I thought Comcast allowed it.