package mail // Header represents a mail header field name type Header string // List of common header field names const ( // HeaderFrom is the "From" header field HeaderFrom Header = "From" // HeaderTo is the "Receipient" header field HeaderTo Header = "To" // HeaderCc is the "Carbon Copy" header field HeaderCc Header = "Cc" // HeaderPrecedence is the "Precedence" header field HeaderPrecedence Header = "Precedence" // HeaderDate represents the "Date" field // See: https://www.rfc-editor.org/rfc/rfc822#section-5.1 HeaderDate Header = "Date" // HeaderMessageID represents the "Message-ID" field for message identification // See: https://www.rfc-editor.org/rfc/rfc1036#section-2.1.5 HeaderMessageID Header = "Message-ID" )