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RFC 3501, "INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1", March 2003

Source of RFC: IETF - NON WORKING GROUP
Area Assignment: app

Errata ID: 3032
Status: Verified
Type: Technical
Publication Format(s) : TEXT

Reported By: Bron Gondwana
Date Reported: 2011-11-15
Verifier Name: Peter Saint-Andre
Date Verified: 2011-11-15

Section 6.3.1 says:

   Responses:  REQUIRED untagged responses: FLAGS, EXISTS, RECENT
               REQUIRED OK untagged responses:  UNSEEN,  PERMANENTFLAGS,
               UIDNEXT, UIDVALIDITY

[...]

         OK [UNSEEN <n>]
                     The message sequence number of the first unseen
                     message in the mailbox.  If this is missing, the
                     client can not make any assumptions about the first
                     unseen message in the mailbox, and needs to issue a
                     SEARCH command if it wants to find it.

It should say:

   Responses:  REQUIRED untagged responses: FLAGS, EXISTS, RECENT
               REQUIRED OK untagged responses:  PERMANENTFLAGS,
               UIDNEXT, UIDVALIDITY, UNSEEN (if any unseen exist)

[...]

         OK [UNSEEN <n>]
                     The message sequence number of the first unseen
                     message in the mailbox.  If there are any unseen
                     messages in the mailbox, an UNSEEN response MUST
                     be sent, if not it MUST be omitted.
                     If this is missing, the client cannot make any
                     assumptions about the first unseen message in the
                     mailbox, and needs to issue a SEARCH command if
                     it wants to find it.

Notes:

There is a conflict between "REQUIRED" on the UNSEEN response and having no value to send. This change documents the approach taken by existing servers.

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