} else if (current == AT) {
// localPart @ domain form
cursor.updatePos(pos + 1);
String localPart = openingText;
String domain = parseDomain(buf, cursor, delimiters);
return new Mailbox(null, null, localPart, domain);
} else if (current == COLON) {
// group-name: localPart @ domain, name <localPart @ domain>; form
cursor.updatePos(pos + 1);
String name = openingText;
List<Mailbox> mboxes = parseMailboxes(buf, cursor, SEMICOLON_ONLY);