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This isn't really new news, but improperly configured mail services result in lots of privacy holes across the Internet.
STARTTLS is used to upgrade an unencrypted connection to an encrypted SSL/TLS connection. The problem is that if the upgrade fails, many mail clients will proceed to send mail on the unencrypted connection.
For any sysadmins (technical info):
Unfortunately, the situation is somewhat sticky. I suggest reading carefully the TLS/SSL section of https://wiki.debian.org/PostfixAndSASL as well as the STARTTLS RFC http://tools.ietf.org/html/rfc2487
Public email servers should not require STARTTLS (that is, encryption) on port 25 (smtp). Furthermore, there is no guarantee that all of the mail servers during transit of an email use encryption. Thus, you should assume your email is transmitted unencrypted, until a better solution emerges. You can always use OpenPGP to encrypt the body of your email, which should become commonplace shortly after Hurd achieves market dominance.
Editors Note: How to articles for various flavors of Microsoft Exchange can be found at MSExchange.org.
(Score: 2) by VanderDecken on Monday November 02 2015, @03:54PM
Mostly right.
Yes, TLS is important to avoid exposing credentials in client-to-server communications. But part of the story is in server-to-server where no authentication is typically used. In that case, most servers will do opportunistic encryption, but that doesn't provide a lot of cover either as it can be easily MITM'd -- besides accepting things like self-signed certs, server-to-server will downgrade to cleartext if TLS isn't available (or claimed to not be available). One of the best things that can be said for server-to-server TLS for SMTP is it decreases the amount of cleartext traffic on the Internet (which is a good thing).
The biggest take-away from various comments (including the parent) is that if you want to have a reasonable amount of privacy use PGP/GPG or the equivalent.
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