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string subject = 3
string html = 4
repeated Attachment attachments = 7
map<string, string> global_fields = 8
string subject = 3
string template_id = 4
repeated Attachment attachments = 7
map<string, string> global_fields = 8
Used in: SendHTMLReq, SendTemplateReq
string filename = 1
bytes content = 2
Used as response type in: Mailer.SendHTML, Mailer.SendTemplate
string message_id = 1
string template_id = 2