For those of you just tuning in, “SMTP TLS” is a technology that allows email servers to transmit your email messages between themselves securely, preventing eavesdropping on the email messages sent. Read all about SMTP TLS.
Use of TLS is not standard on an email server. It requires special certificates to be purchased, installed, updated periodically. It also imposes a burden on the servers … all that encryption takes a lot more effort and thus costs more money to operate and maintain. For large providers like AOL which receive extremely large numbers of email messages every day for their members, support for SMTP TLS requires many more email servers and much more work by the server administration staff.
As a result, most major free ISPs (like AOL, and Yahoo, and Comcast) do not support TLS and have never supported it. But with the increasing demand for security and with TLS being “something relatively easy”, we are seeing more hosts offering TLS.
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