Mail not working on iPhone after iOS 18 Update

It's not always the iOS update's fault!  Many things can cause phone problems.  If you tell people you think it's an iOS update, it might make it harder to fix or find a solution for the real issue.

Remember, the right question often leads to the solution! Please look in the right direction.

iOS updates aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. The majority of the issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

Kindly consider checking your settings and addressing any device issues before attributing the issue to external factors. This could be a pure coincidence that the iOS update affected the iPhone functions.

Before initiating a standard iOS update, it's advisable to create a backup. Have you completed this step? If yes, proceed with the restoration from the backup.

See what each update does: iOS 18, About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...

1. Is this your corporate iPhone? Then please contact the system administrator of your corporate
2. If it is your personal device, in that case, do you have any profile installed by your corporate/organisation/enterprise/School Management?
   1. Erase the profile added by you If you have installed a profile on your own --> Install or remove configuration profiles on iPhone - Apple ...
   2. Or please contact the system administrator of the organisation who provided the profile to you

It's crucial to emphasize that when you enable 2-step verification for your Outlook (Hotmail) account, you need to utilize a specially generated app password from Microsoft to access the same account through the iOS mail app. --> Manage app passwords for two-step verification

Using an app password is essential if you enabled two-step verification for your Outlook (Hotmail) account. Two-step verification adds an extra layer of security by requiring a code from your phone or authenticator app in addition to your password when signing in. Regular passwords won't work with apps that don't support two-step verification, which is why Microsoft created app passwords. Just generate an app password for your iPhone's mail app and you'll be good to go!

Here are some additional points you might find helpful:

• You can generate app passwords through your Microsoft account security settings.
• App passwords are unique and only work for the specific app they're created for.
• Consider creating strong and unique passwords for your Microsoft account and other online accounts.

This applies to Google, Yahoo and Aol too.

You may have enabled two step verification on Google --> Sign in with App Passwords - Google Account Help

You may have enabled Authenticator for Yahoo --> Generate and manage third-party app passwords | Yahoo Help

You may have activate 2-step verification for Aol --> Create and manage third-party app passwords - AOL Help

Here

TLS 1.0 and TLS 1.1 are being deprecated due to security concerns: 

• Security vulnerabilities
• TLS 1.0 and TLS 1.1 are vulnerable to a number of attacks, including POODLE, BEAST, CRIME, FREAK, and LOGJAM. These attacks can compromise encrypted communications and expose valuable data. 
• Compliance requirements
• Many organizations, including government agencies, must meet compliance requirements that mandate the use of TLS 1.2 or higher. 
• Evolving standards
• Internet standards and regulatory bodies are evolving to provide improved security. 

Here are some details about the deprecation of TLS 1.0 and TLS 1.1: 

• Windows
• TLS 1.0 and TLS 1.1 will be disabled by default in Windows 11 Insiders Preview and Windows Server Insiders Preview releases in 2024. This change applies to both client and server devices. 
• Azure
• Azure will remove support for TLS 1.0 and TLS 1.1 for new and existing storage accounts by October 31, 2024. 
• Internet Engineering Task Force (IETF)
• The IETF officially deprecated TLS 1.0 and TLS 1.1 in March 2021. The IETF recommends that companies, government agencies, and software developers use TLS 1.2 and TLS 1.3. 

Indeed. See my earlier post and you'll see I spent hours on a call with Apple Support and they had me install MS Outlook to confirm it wasn't some network issue, despite my sharing the email server logs that showed that the Mail app was not responding after making a connection. Super weird.

So, know we know that the following email clients work with iOS18 (and presumably iPadOS 18, because they are close cousins and both are exhibiting this problem):

• Microsoft Outlook
• Spark Mail
• Canary Mail

Someone a week or so noticed the forward slash "/" was "grayed out" at Setting>s>Apps>Mail>Mail Accounts>YOUR Mail Account>Account Settings>Advanced>IMAP Path Prefix / (the "/" is a light gray)

So the person suggested typing in a new forward slash over the gray forward slash, and then "backing out" with a "Done" to save the change. I did this, but my problem continued. So here is what I did instead:

• I again went to ... >Mail> ... "IMAP Path Prefix /" This time I typed a "/" next to the grayed out / and then using my backspace, I deleted the grayed out /, leaving the new one I typed.
• I then hit "Back" and then "Done" and got exited Settings.
• Lastly, I did a hard boot reset of my phone: 1. Press and release side button volume up. 2. Press and release side button volume down. 3. Hold right side power button UNTIL phone shuts down (DON'T swipe the shutdown switch) AND the phone restarts WITH the Apple. THEN, release power button, but only after seeing the Apple upon restart.

After doing this, my mail is working properly. Don't know if it is coincidence or if Apple remotely fixed the problem. I am inclined to think Apple has not resolved the problem yet, because I still see postings on this sight.

Didn't work for me. I've tried multiple times.

Millions of people have upgraded and not experienced this problem.

Thanks for trying, really appreciated, but at least in my case it doesn't solve the problem. Happy for you anyway.

Same problem for we. Email do not work for business IMAP server using TLS 1.3

Same problem here.

Must turn OFF SSL on email server to work with iOS 18.

Very inconvenient, worked without issue with iOS 17.

Please Apple fix this.

Not true.

Any of email service like Gmail Yahoo Icloud Securityfile Mail will NOT working on Mail/App on imap. Thank you.

Not for me and anyway turning it off is a very bad idea/solution to my eyes

Same issue here. And when I go to my mail in settings it’s all “light”, so not able to select anything so I can’t even delete the account.

Same issue. Started immediately after installing ios 18. I now have to add the mail server passwords several times daily.