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I'm implementing a IMAP client, and I have a problem with IMAP mailbox synchronization.
First, it is okay to fetch new mails from IMAP server, but I don't know how to find deleted messages from a mailbox.
Should I fetch all messages from the server and compare it with local data to synchronize?
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IMAP, which is short for Internet Message Access Protocol, is an email protocol that keeps your email in sync across multiple devices, and lets you access your messages from any computer or mobile device. It's a lot more flexible than POP (Post Office Protocol), which essentially ties you to a single device.
Method 1: Check Network Connection An unreliable and poor network connection or firewall settings can obstruct Outlook from synchronizing the mail items stored in the IMAP OST file to the mailbox server. Similarly, if the mailbox server is down, it can prevent Outlook from synchronizing the mail items.
The IMAP protocol supports both online and offline activity. Therefore, messages can be stored both on the local machine and on the server, enabling numerous benefits: Multiple clients can be used to access messages.
When using an IMAP email account, an IMAP folder list can be downloaded that displays all the folders contained in your account on the mail server. You can then select which folders that you want to subscribe to or view on your computer. In Mail, in the Navigation Pane, right-click the top folder for your IMAP account.
The usual approach is to execute the following two IMAP commands for each folder:
. EXAMINE "<foldername>"
. FETCH 1:* (UID FLAGS)
The first command selects a folder and returns the UIDVALIDITY of this folder. If this value matches the previously returned UIDVALIDITY for this folder, you can rely on the UIDs. The second command returns (at least) the UID and all FLAGS for each mail in the selected folder.
\Seen) and deleted mails (\Deleted).This approach is used by many IMAP clients, and most IMAP servers are optimized for them. The limiting factor is usually the available network bandwidth between client and server.
The following situations are a bit more complicated:
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