The IMAP UIDONLY Extension

Document Type Expired Internet-Draft (individual)
Author Arnt Gulbrandsen 
Last updated 2014-10-27 (latest revision 2014-04-25)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Opening a large mailbox in IMAP can take mailbox; 30 seconds is realistic if the mailbox contains ten million messages. Most of that time is needed to number the messages consecutively. This extension provides a way to avoid having to number the messages consecutively.


Arnt Gulbrandsen (

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