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 Fix Outlook and Office365 Sync Issues 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 work in a small company and for the past 2 weeks we've been having issues with customer support Outlook account. The account is used as IMAP in all customer support clients, every time you set up the mail in anyones computer Exchange connectivity diagnostic it just sync 30-50GB ost files... And because of the size, this is making the mail simply stop working after one day of normal use, forcing the users to end outlook process to make the mail sync again properly... But only when you close/open the mail again.

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

These methods help you in the synchronization process. If this does not work, you can contact your email provider. After that, it is also important to secure your IMAP folder to prevent this issue from happening in the future. So, properly follow the above steps and backup your data from IMAP folders. When you right-click one of the folders that doesn't show new mail unless you select it, Properties, is the box 'When getting new messages... It's usually not checked by default for IMAP to minimize network traffic.

• Meanwhile, the "connecting" or "Checking for mail..." just stays on the bottom status bar of the mail app.
• 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.
• My VPN was working in the background, even though the file was closed.
• 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

The problem is that the some changes are not reflected in the Gmail web app. By fix Outlook after Windows update issues web app, I mean webmail accessed via Firefox or Chrome for (say) Windows 10, not smartphone app. To set up a mail account, we can set the same standard name "mail.mydomain.com" as the incoming and outgoing mail server. My comment about 3rd party email -- is a 3rd email app called Email - Edison Mail (from the App Store) I set up my mail accounts in the app and everything works as it should. I’ve tried repairing the data file, removing and re-adding the account, rebooting, re-installing Outlook/Office, running SFC/DISM, all to no avail.

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Mohit is a Microsoft Certified expert for all things Microsoft. He brings a unique perspective gained from nearly a decade of active participation in various IT forums, blogs, and social media. Through this hands-on experience, he has acquired knowledge in diverse domains like Microsoft 365 Cloud, On-Premise Exchange Server, AD, and Entra ID. At first, I was thinking it may be an issue with certificates, but it's not... I went to a bunch of online TLS tests and the mail server is fine and the certificates are trusted...