Mail not working on iPhone after iOS 18 Update

I recently updated to iOS 18.1 this weekend to try fixing a HomeKit problem (constant notifications about cameras "motion detected") and now my IMAP email account isn't updating anymore either. I've tried all of the suggestions posted but nothing is working.

stevepringle wrote:

I found that I had a non printing character on one of the folders on my IMAP server. Renaming this folder to remove the non printing characters fixed all the mail app problems for me.

How did you find it?

Same with me it’s infuriating why can’t mobile data get this stuff like it used to go it’s exasperating I need to send messages and see what I sent before bug it refuses to down load anything I don’t have wifi access or power to plug into how could such a basic problem happen every update its sone darn headache we rely in these devices it simply isn’t good enough

After 18.1.1 upgrade I was asked for exchange password.

Did on iPad seemed ok then

iPhone and tested right away

but all email sends failed.

Message:- cannot send mail

An error occurred while delivering this message.

It occurred right after a message Exchange password is incorrect. With the basic box for the password. Yeah, did it - is the correct password.

Seems that is the clue, yes?

The email issue affecting Winnipeg (if other MB locations-don’t know)

was related to a local service.

It was completely resolved sometime

late evening of Nov 25/2024 or overnight

Nov 25/26 2024.

Suggested if anyone has an issue to sign in

to their account, choose help.

Having also ugraded to 18.1, the issue with my email is not remedied. The iOS update resulted in more than 3,200 old (and previously read amd discarded) emails being returned ‘unread’ toy inbox. Not helpful, Apple.

I just bought the 16 Pro and was having the same issues…Very disappointing and frustrating. I spent hours trying to resolve it unsuccessfully.

I followed your fix and by the time I backed out of settings all mail was restored. The layout is clear and comprehensive. Thanks so much for your excellent tip! :)

Both my iphone and Ipad have done the IOS18.1 upgrade and I have lost the ability to use my yahoo account on both devices. I don't have the IMAP option or anything that relates to incoming mail in advanced settings and guess this is the issue Apple need to fix. Such poor service, you would think they test these upgrades!

I’m also having trouble with emails since the “upgrade”. I tried several remedies I read about on various support pages without success. Like you said, I wish I had waited to upgrade but Apple did the upgrade when I tried to update 17. Very disappointing.

This did not work for me. Neither did removing my account and re-installing it. I can receive email but many messages are dreadfully slow to load. I wish I had waited to “upgrade”. It wasn’t like this with 17.

Found that I could not send emails after updating to iOS 18 on my iPhone. Came across a suggestion that I should renter my “password” in “Settings - email account”. Never thought for one moment it would solve my problem; but it did.

This is why I dread and hate updates! All you do is break things that were working just fine. I’ve now spent hours, to no avail, to get my Gmail to populate in the mail app, I’ve tried all the suggestions including uninstall reinstall check pop and IMAP server settings to get my mail and it won’t work. This is infuriating! Apple for how ridiculously expensive your products are this basic function shouldn’t be such an issue! Get it together! I’m beyond furious!

After the ISO 18 update on my IPad not only did my emails fail to upload or send on the iPad but I lost all mail stored on my PC which I use in tandem to print up various documents from time to time. Why would this happen.

Will we ever get a fix for this problem as you can’t seem to contact anyone at Apple who take your money🙂

Thanks! That seems to have worked.

One clarification: as you correctly stated, the dimmed / character does need to be replaced, but if the device display is in Day mode the replaced character will appear black.

I tried the "/" fix but this didn't work for me.

I noted some folks tried different client apps other than Mail.

Gmail got the same error but MS Outlook worked fine so I am using that without any problems.

iPhone on 18.1.1