AE Send mail SMTP encryption?

Document ID : KB000103101
Last Modified Date : 26/06/2018
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Question:
How secure AE send mail is?
Which email protocol is being used?
Answer:
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