| Value | Meaning |
|---|---|
| none | |
| plain | |
| login | |
| cramMd5 | |
| xoauth2 | Authenticate using XOAUTH2 protocol Works for GMail and Office 365 See_Also: - https://developers.google.com/gmail/imap/xoauth2-protocol#using_oauth_20 - https://learn.microsoft.com/en-us/exchange/client-developer/legacy-protocols/how-to-authenticate-an-imap-pop-smtp-application-by-using-oauth |
Represents the authentication mechanism used by the SMTP client.