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string email_id = 1
string from = 2
string to = 3
string return_path = 4
bytes body = 5
bool should_retry = 6
Used in: apiv1.SendHTMLReq, apiv1.SendTemplateReq
repeated string to = 1
repeated string cc = 2
Used in: apiv1.SendHTMLReq, apiv1.SendTemplateReq
string email = 1
map<string, string> fields = 2
Used in: apiv1.SendHTMLReq, apiv1.SendTemplateReq
string email = 1
string alias = 2