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All messages that were trashed in Outlook still appear in All Mail when accessed using webmail, even days later. With that said - the "delayed syncing" issue that I am experiencing is happening on Inbox as well as Junk folders. So my Junk folders do not have that box checked, but the Inbox doesn't have a box to be be checked - their behavior is the same they are both not syncing, until I manually click on them to force the sync. I have half dozen mail accounts a few microsoft a gamil and some other ones and there is no difference they are all acting the same. In this article, I have explained various ways to solve IMAP folders are not syncing.

Why IMAP Folder is Not Properly Syncing?

Meanwhile, the "connecting" or "Checking for mail..." just stays on the bottom status bar of the mail app. I deleted the Apple Mail inbox repair tool alternative app from the phone, reinstalled from the App Store. So only wait when some "smarties" from apple IT solve problem in app ... Apple programmers use no CD/CI - simple sometimes update by "sales-manager requests", and without any critical-bug-checks ... Full cleanup of ALL accounts is not a solution(and re-add even helps not).

Chosen Solution

I use both webmail and Outlook desktop client to access my Gmail. I am normally looking at the All Mail folder on Outlook. Whenever I drag messages from the All Mail folder to the Trash folder on Outlook, these messages fix Outlook after Windows update issues remain visible in the All Mail folder when accessed via webmail.

IMAP folder sync issue in the new Outlook (moved emails not syncing to webmail)

Microsoft Outlook is terrible in IMAP. Hence most people only use MAPI with it. If you are forced to use IMAP, I would recommend switching to an alternative E-Mail client like Thunderbird Thunderbird — Free Your Inbox.

Meanwhile, the "connecting" or "Checking for mail..." just stays on the bottom status bar of the mail app.If the proxy directs requests to a newer IMAP server implementation (f.i Cyrus imapd 3.6.1), the iOS 18 Mail app works as expected, even the requests are handled by the same IMAP server proxy.A stable connection between your email client and email server depends on the syncing of your IMAP folder.I will try the safe starts and experiment with the buttons ans see if it improves.I deleted the Apple Mail app from the phone, reinstalled from the App Store.After instalation ios 18 all my accounts in mail app stopped to sync( including icloud mail).It's usually not checked by default for IMAP to minimize network traffic.

My accounts in Mail app stopped to sync post update

I am also running QuickFolders and its the same nothing shows up on those tabs until i physically click on them. Ok so my mistake the Properties option is there when right Outlook stuck updating folders solution clicking folder - I was only focused on right clicking on the email address to take me to server setting I was not clicking on the actual folder. I right click a folder and Properties and it take me to attached windows. I don't see - 'When getting new messages...

Wonder if the vpn is causing an issue. Perhaps something in TB needs to be tweaked. I have no firewall monitors running during the day that would interfere just the vpn. I have several email accounts / IMAP set-up. So looking at my tree of email accounts one inbox might have 10 mail total and 3 unread form earlier.