Upgraded software now email won't work
Upgraded iPhone 12 to 17.4.1 and now emails not working.
Upgraded iPhone 12 to 17.4.1 and now emails not working.
Remove your email account and set it up again
Make sure that all of your emails are there or make sure that your email is saved somewhere other than your device. On your device, go to Settings > Mail, then tap Accounts. Tap the email account that you want to remove. Tap Delete Account.
If you can't receive email on your iPhone, iPad, or iPod touch ...

If you can't send an email on your iPhone, iPad or iPod touch
If you can't send an email on your iPhone, iPad or iPod touch ...

Which email account are you referring to? Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other (Refer to the pic )below


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:
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
Remove your email account and set it up again
Make sure that all of your emails are there or make sure that your email is saved somewhere other than your device. On your device, go to Settings > Mail, then tap Accounts. Tap the email account that you want to remove. Tap Delete Account.
If you can't receive email on your iPhone, iPad, or iPod touch ...

If you can't send an email on your iPhone, iPad or iPod touch
If you can't send an email on your iPhone, iPad or iPod touch ...

Which email account are you referring to? Google, iCloud, AOL, Exchange, Outlook, Yahoo or any Other (Refer to the pic )below


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:
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
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!

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: 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...
Upgraded software now email won't work