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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Posted on Sep 17, 2024 8:49 PM

I’d get the server to TLSv1.2 and with forward security configured minimally, and test again.


IMAP (read, receive) and ESMTP (send) are separate network services, so check both.


There are various ways to check the TLS and cipher offers by a server, and curl and testssl among those,:


https://stackoverflow.com/questions/40557031/command-prompt-to-check-tls-version-required-by-a-host


Also check the IMAP and ESMTP server logs for any failure-relevant details that might be included there.

532 replies

Feb 21, 2025 11:59 AM in response to IdrisSeabright

Folks should be very cautious in deciding whether or not to purchase the new iPhone 16e. iOS 18 was “not ready for Prime Time” right out the gate and likely the 16e won’t be either - Apple is using its very first, own cellular modem within it and is using the 16e as a sort of public test to see how it performs before deciding to use it in the more expensive phones… buyer be (a)ware for sure.

Feb 28, 2025 10:25 AM in response to Steven Casman

Steven Casman wrote:

Folks should be very cautious in deciding whether or not to purchase the new iPhone 16e. iOS 18 was “not ready for Prime Time” right out the gate

I haven't had a single issue with iOS 18. In fact, most people haven't. Yes, there are people who don't like some of the changes but that doesn't mean there's something wrong with the update. It just means Apple can't please everyone all the time.

Feb 28, 2025 10:44 AM in response to IdrisSeabright

You have previously expressed this same ill-informed and incorrect position.


There is definitively a documented and significant architectural change to iOS 18 Mail that has completely disabled it for many people. It is foolish to characterize a completely disabled mail account as a change that a few people don’t like.


Your repeated comments to this same effect are unhelpful disinformation.

Feb 28, 2025 1:25 PM in response to nxnw

nxnw wrote:

You have previously expressed this same ill-informed and incorrect position.

Which is "incorrect?" My opinion about how well iOS 18 works? Or my link to instructions on how to add an iCloud mail account to a Samsung tablet. Or perhaps you object to my giving out the Feedback link?

Your repeated comments to this same effect are unhelpful disinformation.

Until you get a job with the group at Apple who manages the forum, you don't get to decide who posts and who doesn't.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

Mail not working on iPhone after iOS 18 Update

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