DKIMSignAlgorithm
LoginOption
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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StartTLSOptions
either DISABLED, OPTIONAL or REQUIRED
DISABLED means STARTTLS will not be used in any case
OPTIONS means STARTTLS will be used if the server supports it and a plain connection will be used otherwise please note that this option is not a secure as it seems since a MITM attacker can remove the STARTTLS line from the capabilities reply.
REQUIRED means that STARTTLS will be used if the server supports it and the send operation will fail otherwise
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