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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.

460 replies

Dec 30, 2024 9:16 PM in response to mikefromfort wayne

I wish I was as lucky as you. You should go buy a lottery ticket. My new iPhone 16 Pro Max is buggier than the Amazon rainforest. I have tried every fix suggested to me by Apple support, and nothing has worked. This has been an issue since I got my phone, two weeks ago. The native mail app works fine, as long as it is connected to a power source. When not connected to a power source, I have every single mail issue that has been mentioned in this thread.

Dec 30, 2024 9:37 PM in response to Nitegoat

Nightgoat - Your problemS sound so severe that I would recommend considering doing a full reset to original factory conditions (be sure to do it CORRECTLY! then reinstalling the OS over WiFi, all while plugged in (or downloading to a Mac and installing from there) and if that does not correct the problem paying a visit to the Apple store closest to you even if it’s an hour’s drive to get to it - still better than having to call Apple and spending the hour or more on the phone only to have to ship it off to them. It’s entirely possible that the phone you received has one or more hardware faults and/or that its OS installation was corrupted.

Jan 4, 2025 5:35 PM in response to Lordblanca

I do not even have VPN installed on my iPhone 14. So, that is not it.


I am running iOS 18.2. The Mail App stopped working when I moved from 17 to 18 last month. (Moved to 18 first on my work iPhone 13, and email worked there, but since we are only authorized to use Outlook on the work phone, I did not realize the Mail App issues until I updated my personal iPhone. I can still get email via my Outlook and Gmail Apps, but since many other Apps auto-launch the Mail App for MFA, this is really burdensome.)

Jan 4, 2025 5:54 PM in response to Joat23

After testing and deciding to use Gmail on my iPhone SE (3rd Gen) because of the issues with iOS 18, I completely deleted the Apple Mail app. In Settings>>Apps>>Gmail you can specify the Default Email App, which I have set to Gmail. This last step may not be necessary if you do not have any other mail apps installed. This may help with the auto-launch issue.

Mail not working on iPhone after iOS 18 Update

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