Hotmail

UID SEARCH sometimes returns UIDs in non-ascending order – that violates RFC 3501

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Archived post from September 19, 2013. Product: Hotmail – no longer developed by its maker. Details may be out of date.

Question asked on Sep 19, 2013
Our app, mailstrom.co, connects to the Outlook IMAP server on behalf of many accounts. For some users, UID SEARCH is returning UIDs in non-ascending order; we are not able to process mail for these users. The condition seems to only affect certain accounts, and the same request always returns the same mis-ordered list of UIDs for that account.

See section 2.3.1.1 of RFC 3501 – "Unique identifiers MUST be strictly ascending in the mailbox at all times." http://tools.ietf.org/html/rfc3501

I can share with support the account names that have this condition. Thanks for helping to get this resolved.

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