AE Send mail SMTP encryption?

Document ID : KB000103101
Last Modified Date : 26/06/2018
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How secure AE send mail is?
Which email protocol is being used?
Basically, current we only support send email via SMTP port 25. It mean your email will not be encrypted in transit. 
We can't customize it at the moment.

Additional Information:
The security concept of Automation Engine is described here:
For more detail, please also look at these communities discussions:

Connections in an AE environment Secure Mailrelay server