UserProvided
Encoding of the email is provided by the sender and not altered.
None
No endcoding is set for the email.
Raw7bit
Encoding of the email is in Raw7bit format.
Raw8bit
Encoding of the email is in Raw8bit format.
QuotedPrintable
Encoding of the email is in QuotedPrintable format.
Base64
Encoding of the email is in Base64 format.
Uue
Encoding of the email is in Uue format.