I have STARTTLS enabled in Sendmail. In the log, when I received mail from my partner, I see this:
Oct 15 09:09:40 mail mail:info sendmail[33326]: STARTTLS=server, relay=x.x.x.x, version=TLSv1/SSLv3, verify=OK, cipher=RC4-SHA, bits=128/128
When I send mail to my partner, I see this in the log...