func (mid MsgID) String() string {
	if len(mid) == 0 {
		return "-"
	}
	return string(mid)
}
// String is the RFC representation of the message ID.
String is the RFC representation of the message ID.
// String is the RFC representation of the message ID .
func (mid MsgID) String() string {
	if len(mid) == 0 {
		return "-"
	}
	return string(mid)
}
func ( mid MsgID ) String ( ) string { if len ( mid ) == 0 { return " " } return string ( mid ) }
String is the RFC representation of the message ID.
String is the RFC representation of the message ID .