The raw text of the message. The client is responsible for ensuring the following:

• Message must contain a header and a body, separated by a blank line.
• All required header fields must be present.
• Each part of a multipart MIME message must be formatted properly.
• MIME content types must be among those supported by Amazon SES. Refer to the Amazon SES Developer Guide for more details.
• Content must be base64-encoded, if MIME requires it.

public RawMessage RawMessage { get; set; }