Email sending is supported in Gekkota. This is the list of supported authentications:
(1) These authentications are not active by default with a Google account. To activate them, go in Google account parameters menu, and activate the option "Allowing less secure apps to access your account"
The authentications below (used by example by Google) are not supported:
NOTE FOR MS-EXCHANGE 365 ACCOUNT
Given the SSL negociation is done afterwards, the URL has to follow the scheme smtp:// (and not smtps://) ex: smtp://smtp.office365.com:587