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Mail not working on iPhone after iOS 18 Update

Hi guys,


After updating my iPhone from iOS 17.7 to 18, I encountered an error with my work email. It's showing "IMAP server is not responding."Our mail server uses TLS version 1.1. Does iOS 18 support this version? Can you confirm?




[Re-Titled by Moderator]

iPhone 12, iOS 18

Posted on Sep 16, 2024 10:04 PM

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Question marked as Top-ranking reply

Posted on Sep 26, 2024 7:41 PM

I added / (forward slash) in the IMAP Path Prefix field in IMAP account ( settings > Apps > Mail ) as suggested here in step 5 : 8 Steps to Fix Mail App Issues After Updating to iOS 18 and the issue is now resolved.

229 replies

Oct 4, 2024 3:18 PM in response to manojWijesinghe

I am not happy at all! I have purchased every iPhone since its birth. I have an IPad Pro and a a MacBook Pro. This issue with IOS 18 turned my work imap email on my iPhone and iPad in to bricks. I tried all of the proposed fixes in this thread! Come on Apple this is the best you can do in new software deployment? You should be ashamed! I am waiting for the fix! My imap email on both can send emails and I get green check marks on all systems go but can get my inbound emails! Really unhappy and frustrated

Oct 7, 2024 10:22 PM in response to mikefromfort wayne

mikefromfort wayne wrote:

 - Type a forward backslash “/“ next to the grayed out /
 - Now delete the grayed out forward backslash “/." Just tap to the left of the new backslash you typed and backspace to delete the grayed out backslash.

Are you sure you didn't already have a forward slash there? In my case, the gray forward slash isn't an editable character. You can't type next to it. When you insert a new slash, it just replaces the gray one.

Oct 9, 2024 1:39 PM in response to manojWijesinghe

Hello, somehow, self-signed certificates don't work anymore (even though they could be trusted before and most likely adhere to the requirements).


I was able to provide MDM payload with a Step-CA root certificate, its intermediate certificate and the signed certificate of the mailserver - it seems to be important that the chain of trust be completely working, including working DNS and alt name of the host. With iOS18.0.1, i have my mail back working.


If there are other bugs (like Prefixes on IMAP paths) i don't know, but i did not experience them and by looking in the SMTP/IMAP server logs, i was confirmed enough that TLS did not work.

Oct 9, 2024 2:42 PM in response to cduerr

Correct. The problems were created with very much tightened email security measures (need for which was prompted by nefarious international hackers) unevenly implemented across programmers and service providers. I’m sure they are still working their way through the necessary fixes but it is best for everyone notify their own relevant providers/companies.

Mail not working on iPhone after iOS 18 Update

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