Reviewer: Barry Leiba Review result: Ready with Issues — Section 3 — Once the UIDONLY extension is enabled (see Section 3.1), the client MUST NOT use message sequence numbers (including the special marker "*") in any arguments to IMAP commands, and the server MUST return tagged BAD response if the client uses message sequence numbers. The server SHOULD include the UIDREQUIRED response code in such BAD responses (see below). I see nothing below that says why this is SHOULD rather than MUST, and I can’t imagine any justification for not including it. Why is this SHOULD? -- last-call mailing list last-call@xxxxxxxx https://www.ietf.org/mailman/listinfo/last-call