If you can take a look at your mail server settings specifically the IMAP and SMTP. Make a note of the values and delete an overwrite them also check your passwords for both SMTP and IMAP. Make sure they are the same if you can’t see them look at the number of stars or dots.

Why IMAP Folder is Not Properly Syncing?

Please report suspicious activity using the "Report Abuse" option. Windows 10 will reach EOS (end of support) clear Outlook credentials manager on October 14, 2025. For more information, see this article.

Chosen Solution

Suspect some Apple Dev's have been lazy with some code disable faulty add-ins in Outlook in IOS18's mail.app and its causing the issue. I was a little hesitant but went ahead and let it completely remove all the synced items from the account off of my iPhone. After a minute, it was removed so just went and re-added it and BOOM. Decided to just try completely removing my Gmail account, the one that wasn’t syncing with the Mail App after the iOS 18 update.

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

The responsables of the mail told us to move all the mails from past years to a new account to reduce it's size, but after doing that it doesn't seems to be working. This problem isn't anything new, this happens every year or so, but this time it just isn't getting fixed. By reporting abuse, a moderator will be asked to review the content of this interaction to take further action, if necessary. Some reference links I read thru though I don't fully understand all of what is being discussed. I have not tried the add-on yet I am going to experiment.

• 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.
• I will try the safe starts and experiment with the buttons ans see if it improves.
• I have no firewall monitors running during the day that would interfere just the vpn.
• 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).
• By reporting abuse, a moderator will be asked to review the content of this interaction to take further action, if necessary.

My accounts in Mail app stopped to sync post update

When you are dealing with any problem, it is important to understand the reasons behind the issues. Below are some causes that contribute to the problem. There are various variables at play here however, generally speaking, Outlook performs best when operating as a front end for Microsoft Exchange and Gmail when accessed via a web browser. I’ve never heard of setting a path before for email, so apologies if this is a simple solution to those who come across this in the future. If Outlook stuck updating folders solution you can, turn off IMAP, require 2FA, and use the native outlook client. Hate to be a Debbie Downer, but why are you using IMAP?





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...