imap - What modseq value to cache? -

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I am reading, trying to figure out how a customer should behave when he Communicates with the server which is CONDSTORE but QRESYNC not.

The case of the initial connection is fairly simple: the client compares its cash modal value to HIGHESTMODSEQ with the select command, and if it is low , Then the customer can receive any change with FETCH + CHANGEDSINCE or SEARCH + MODSEQ . After doing this, the HIGHESTMODSEQ value for the client mailbox can store its new cash modal value.

However, if the customer receives an unwanted FETCH , responses when selecting a mailbox, does it contain any reliable findings from the MODSEQ attributes in these updates Can it be removed? Will it be safe to cache the highest seen MODSEQ value, or does the client take the risk of missing an update in the mailbox state to do so?

This is difficult. The question probably refers to a language in RFC 716, which explains that HIGHESTMODSEQ and MODSEQ are two different animals, and one < code> FETCH MODSEQ , while a server is forced to withdraw some EXPUNGE s, perhaps because the client sent a command MSN (see chapter 3.2) .

In this special case where the server is only CONDSTORE and not QRESYNC , MODSEQ and HIGHESTMODSEQ is used only to track metadata changes (such as flags updates). On expunges the message, they have to change not in which case RFC is trying to stop due to QRSENCN, without any fatal consequences, as you would like the customer No can use HIGHESTMODSEQ for any other purpose, but on the basis of Flags update, I do not see any reason that a customer will get the See MODSEQ by HIGHESTMODSEQ to CONDSTORE on the server only And should not be. .

You should probably ask on the IPP protocol mailing list and get an explanation. I also have an open bug about how to handle it properly, and RFC is not quite clear to me.

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