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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.

321 replies

Sep 18, 2024 4:24 PM in response to Dtlwssm_2022

Dtlwssm_2022 wrote:

AGAIN! Maybe the software people should go back to testing their software before making so many people’s computers useless, until they’re ready to fix it. No customer service here.


I’d suggest logging the details of this error with Apple or with Apple Support, including the errant folder names and the IMAP server identity and version, as IMAP is less than completely standard.

Nov 4, 2024 7:46 AM in response to manojWijesinghe

Everything was working fine for me until this past Friday. Now NONE OF MY IMAP ACCOUNTS CONNECT within the MAIL app!!


I am not able to access my IMAP accounts now on the following:


  1. iPhone 15 Pro Max - iOS 18.0.1 (only works when I close the app and restart it)
  2. 2015 MacBook Pro Big Sur 11.07.10 - was working fine until today, Nov 4, 2024
  3. 2023 MacBook Pro that is 3 days old running Sequoia 15.1 - zero connects


It continually tells me on my MacBooks that it cannot access the servers to verify.


On iPhone I get error POSIX 60, close the app, restart and it will access accounts until the error pops up again.


I have called and reported all of these issues and totaled close to 6 hours with senior support doing EVERY troubleshooting step possible. I now have an open case that shows all of these issues. I would encourage others to do the same, as that is the only way the engineers are going to look at the software. I was told by support that they do not check this forum for issues.


Mail not working on iPhone after iOS 18 Update

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