Have you updated to 18.2 ?
I had and have no Problems and am on 18.2 now.
discussions.apple.com
Sep 19, 2024 10:19 PM in response to manojWijesinghe
Hi All,
After much frustration, this problem was
resolved for me by adding a
/ (forward slash) in the IMAP Path Prefix field.
The Path Prefix field can be found under
Settings>Apps>Mail>Mail Accounts>[your IMAP account]>Account Settings>Advanced ... then in the
Incoming Settings section you will find
IMAP Path Prefix (it may have a slightly grey / after it. Type / and the / will turn white. Then back out of that menu and press Done. Close settings and your mail app. Open your mail app and see if it now works.
Note: some people add INBOX to the path prefix, but at least in my case this prevented the other folders from syncing as they are in the root of the IMPA server.
Hope it works for others - this was SO frustrating!
Cheers!
Sep 22, 2024 5:03 PM in response to manojWijesinghe
Apple Support has informed:
that they are aware of the problems with the iOS Mail apps under OS 18.
The problems are NOT confined to just external IMAP email accounts but affect Apple email accounts (eg
_____@icloud.com) as well.
Deleting the Mail app and reinstalling is NOT expected to fix the problems, and doing that is at this point in time NOT recommended by Apple as a possible fix.
The problems seem to also extend to issues with mail accounts not being able to properly sync between devices as well.
Deleting individual email accounts and re-entering them etc. may OR MAY NOT result in a “permanent” or even temporary fix.
So it looks like we’ll have to wait until Apple sorts it all out and issues one or more updates. FYI it looks like mail is working reasonably well on my iPad running iPad OS 18 but mail on my iPhone running iPhone OS 18 is a bit of a disaster.