@Bunnz said in "proxy handshake error"/"Failure when receiving data from the peer" when using proxy with Mail Module:
And proxy is working in HTTP request just fine
email ports are disallowed for these proxies.

MAIL is used to receive and process the content of letters in mail services. For example, if you register accounts on any sites where you receive registration confirmation letters or a special confirmation code. This module is equipped with all the necessary functionality for this kind of tasks, it is completely free and comes in the official BAS assembly.
More information in telegram chat @bas_english