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 17, 2024 8:40 PM

None of this advice is relevant to this issue. As I replied to someone else above, the very same mail account can send mail using iOS mail app - which means the phone can authenticate the account AND TLS works. The issue is the the iOS and iPadOS mail app fails to get new mail from imap servers. This is a bug. . It’s very disappointing to see Apple make a mistake in such a primary function.


[Edited by Moderator]

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Dec 10, 2024 10:02 AM in response to manojWijesinghe

Here is a temporary fix. At least you’ll be able to download your mail without errors. On the advanced tab of your settings, for the inbox.


scroll down to incoming settings and turn off the SSL, that’s it. Mail flowed.


It goes against the whole idea of SSL but since Apple isn’t proactively making us feel like they have our backs, this solution worked and I was able to use the native mail app.


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Sep 18, 2024 10:50 AM in response to AnarethoS

Ok. I found the problem on my side!


The 2 accounts that where not working where using IMAP folders with some specials characters in their name.


No problem with iOS 17 and many years prior that. And no problem with other mail client ... but they makes the connection fails with iOS18.


After I renamed thoses folder (and changed all my setting on all my different clients...) ... it works again!

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Sep 19, 2024 3:18 PM in response to KiltedTim

KiltedTim wrote:

Millions of people have upgraded and not experienced this problem.

You might not have noticed the news today.


millions of Rogers network users in Canada did experience this issue. Plus there are numerous tech blogs bubbling about it.


It seems to me that TWO big regressions are active in this release - iOS mail client has some funky bugs with imap prefixes; and, there’s this fetch mail bug also.


the OP may well have a separate issue with the TLS 1.1, but this ios/ipados 18 mail app issue is growing and already pretty big.


apparently ipadOS is bricking iPad pros also. Thankfully, I didn’t experience that bug.

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Oct 1, 2024 8:52 AM in response to polkamatic

I have this exact issue and adding a forward slash (/) does nothing. This is a bug, as Polkamatic stated, and I want to know when this will be fixed.


My biggest issue is that it only happens with one of my Gmail accounts. I don't even know how that is possible.

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Oct 4, 2024 5:36 AM in response to anc77

Sadly it doesn't! I'm hoping when 18.1 finally comes out it will address this.


I personally tried everything so far. Deleted app, deleted accounts, readded them, erased iPhone, restored from backup, restore as new, forward slash, "INBOX", changing auth methods, changing push/fetch etc.


Nothing worked. And behaviour is the same as mostly everyone else. IMAP fails to fetch new emails despite SMTP working just fine. All my servers are my own work servers running on OSX 10.13.6 on Server 5.6.1. TLS is 1.2


MacOS is unaffected only iOS18 and 18.0.1 and also ofc iPad OS. iOS 17.7 still works just fine but Apple stopped signing those so hurrray for no ability to rollback either.

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Oct 7, 2024 1:48 PM in response to polkamatic

I am having the same issue. After upgrading to iOS 18, I am no longer able to receive emails to my Inbox. Interestingly enough, I do get receive mail in my Junk folder, and am able to send email. I just cannot receive email to my Inbox. I hope Apple fixes this soon.

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Oct 7, 2024 2:45 PM in response to Community User

NickAleshgo wrote:

I'm trying to help people who need that, but not like you, please ignore that, thank you.

No, you are trying to financially benefit from your spammy posts that do not in any way address the problem.


The service you keep promoting, Securityfile, is a rinkydink operation at which you are programmer, tester, etc. – that's what your profile said yesterday, before you deceptively changed it. Moreover, I personally would be concerned about its safety, given that I can't find any evidence of anyone using it, reviews, or anything to give me any comfort that it is even on the level.


Please stop. Your posts are unhelpful noise.

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Oct 8, 2024 4:52 AM in response to Steven Casman

This is a partial update, since my problem is not yet solved.

I called Apple HelpDesk last Saturday as you indicated (thank you) and I passed 2 hours with them. They collected all the information I could give them. Then I was invited to reinitialise my phone (which is cumbersome, but no other solution than do what they want) and got an appointment for today at 12.00 (Paris time).

Note: this was a partial reinitialisation that did not put the phone back to factory settings (so I did not need a backup to restore it), but I had to reconfigure every app again. Credit cards are also deleted as well as ALL wifi passwords saved on the phone. (solution to it: go to the Passwords app, check the Wifi passwords stored there, save them somewhere else).

Today I had first on the phone a technician who after 30 min passed the call to an ‘upper level technician’. He (they all connect to your phone) did some actions on the phone (just to verify once again the problem and some settings) and collected some info via screen capture as well as the history of the phone. Next appointment is due for next Tuesday.

If you have the same problem with a second iPhone which was also updated to iOS 18, please mention it to them. It is an important information.

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Oct 8, 2024 11:35 AM in response to nikap63

If you have a non-Apple email service that you access via Apple’s Mail app and that is not functioning correctly with that Apple app as it once did then I do strongly recommend that you contact THAT email service provider as well. I know that doing so can often be a relatively major time commitment but they *should* be able to be at least as helpful as Apple was for you if not moreso (no guarantees though, of course).

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Mail not working on iPhone after iOS 18 Update

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