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RFC 6154, "IMAP LIST Extension for Special-Use Mailboxes", March 2011

Source of RFC: morg (app)

Errata ID: 5431
Status: Rejected
Type: Editorial

Reported By: Bron Gondwana
Date Reported: 2018-07-19
Rejected by: Alexey Melnikov
Date Rejected: 2018-07-26

Section 2 says:

An IMAP server that supports this extension MAY include any or all of
the following attributes in responses to the non-extended IMAP LIST
command.

It should say:

An IMAP server that supports this extension SHOULD include any or all of
the following attributes in responses to the non-extended IMAP LIST
command.

Notes:

There exist clients which send a non-extended LIST command and will correctly display and interact with mailboxes usefully if their special-uses are given in the response.

Because of this, many servers are already replying with the special-use attributes, and there are no known reports of clients being broken by that behaviour. Because of this, the MAY should be raised to a SHOULD, and server implementations should default to turning this on.
--VERIFIER NOTES--
The right way to make this change is to revise the document. MAY was intended at the time of publication.

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