possible options for a login into a SMTP server either DISABLED, OPTIONAL, REQUIRED or XOAUTH2
DISABLED means no login will be attempted
NONE means a login will be attempted if the server supports in and login credentials are set
REQUIRED means that a login will be attempted if the server supports it and the send operation will fail otherwise
XOAUTH2 means that a login will be attempted using Google Gmail Oauth2 tokens
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possible options for a login into a SMTP server
either DISABLED, OPTIONAL, REQUIRED or XOAUTH2
DISABLED means no login will be attempted
NONE means a login will be attempted if the server supports in and login credentials are set
REQUIRED means that a login will be attempted if the server supports it and the send operation will fail otherwise
XOAUTH2 means that a login will be attempted using Google Gmail Oauth2 tokens