cified email <b>address</b>. The mailbox syntax of RFC 822 is supported, comments are not allowed, and no attempt is made to normalize quoted characters. The mailbox syntax of RFC 6531 is supported for SmtpUTF8Mailbox address in subjectAltName according to RFC 8398, with similar limitations as for RFC 822 syntax, and no attempt is made to convert from A-label to U-label before comparison. The <b>addresslen</b> argument must be the number of characters in the address string or zero in which case the length i