Apple iPhone 6s Plus email problem: What to do when you're iPhone 6s Plus says "Cannot Verify Server Identity"? [Troubleshooting Guide]

Sending emails on your iPhone 6s Plus has always been that simple and easy with the iOS Mail application. But there are times that things just won’t work as they normally do. Like for instance, you are trying to send an email to someone but then you are prompted with an alert message saying that it “Cannot Verify Server Identity.” A number of iPhone users have encountered this strange notification and are wondering why this happens. If you too are dealing with the same issue and need some help, then you may refer to this content. Keep reading to learn what triggers this alert message on your iPhone 6s Plus and try to fix the problem with the given solutions below.

Based on the message itself, we can tell that it’s software-related. Errors like this can be isolated to the email application you are using on your iPhone. It can be isolated to the Mail app, or your web-based email providers. So basically, it is more on the network system.

But before anything else, if you have a different issue with your device, visit the troubleshooting page we’ve setup for the iPhone 6s Plus. We list down every problem we address each week in that page so try to see if we’ve already addressed your concern before. If we did, try to use the solutions we suggested and if they won’t work, then you may contact us by filling up this form.

Potential solutions and workarounds to “Cannot Verify Server Identity” error

Listed below are some workarounds and possible solutions you can try on to fix the problem and get your iPhone back to sending emails normally or without any more error prompts and strange alerts like this. So here are your options.

First solution: Reboot your iPhone (soft reset).

Minor software glitches are often rectified by a soft reset or reboot on the iPhone. If this error message is triggered by some bugs within the email application you are using or in the iOS mail functions, a soft reset will likely get it fixed. So start by rebooting your iPhone and see what happens afterwards.

  • To do so, press and hold the Power button until the Slide to Power Off screen appears. Drag the slider to turn off your iPhone completely. After 30 seconds, press and hold the Power button again until the Apple logo appears.

Your iPhone will then boot up. Try to create a test mail to send and receive on your device and see if your iPhone still prompts that it cannot verify server identity. If it is, then proceed to the next method.

Second solution: Quit and relaunch the Mail app.

It is possible that the Mail app is glitching or not working properly thus giving you this error. Should this be the case, closing the app and then reopening it can likely get things back to normal again. Minor problems like Mail app’s software crashing can also be rectified in the process.

  1. To quit the Mail app, double-click the Home button on your iPhone. Doing so will launch the App Switcher screen.
  2. Use your finger to swipe up on the Mail app until it no longer shows up in the App Switcher.
  3. After a few seconds, open the Mail app again by tapping on the Mail icon on your Apps screen.

Try to create a message to test sending and receiving email functions on your iPhone. If the message still appears, continue to the next method.

Third solution: Remove your email account from your iPhone and then add it again.

Email issues that are caused by software crashes and random glitches that could not be remedied by a soft reset can be resolved by deleting and re-adding the email account. Doing so will reset your email’s server identity certifications, and therefore allows your email account to be verified by the Mail app. Your actual email account will not be deleted anyway so there is no need to worry. Here’s how it’s done:

  1. Tap Settings from the Home screen.
  2. Tap Accounts & Passwords.
  3. Navigate to the Accounts section.
  4. Locate the email account you want to delete.
  5. Tap on the selected email account.
  6. Tap the red Delete Account button at the bottom of the screen.
  7. If prompted, confirm action by tapping on Delete Account again.

After deleting the email, reboot your iPhone then set up your email account again with the following steps:

  1. Tap Settings from Home.
  2. Tap Accounts & Passwords.
  3. Tap Add Account.
  4. Select your email provider or mail service.
  5. Enter the necessary information.
  6. You may opt to set up the email account automatically or manually. If you prefer the latter, you need to manually enter server settings information for incoming server, outgoing server, port numbers, and the like.

Once the email has been successfully set up, try to create a message and then send it. Usually things should be back to normal with email sending and receiving after doing so but if not, try the next solution.

Fourth solution: Reset All Settings on your iPhone 6s Plus

This methods will erase all of the data stored in the Settings app on your iPhone and be restored to factory defaults. You may opt to carry this out if you cannot track which exactly is causing the problem. Needless to say, it is really difficult to track down software issues and it’s probably the reason why Apple never forgets to integrate an option to Reset All Settings on the iPhones. Here’s how to reset all settings on your iPhone 6s Plus:

  1. Tap Settings from the Home screen.
  2. Tap General.
  3. Tap Reset.
  4. Select the option to Reset All Settings.
  5. If prompted, enter a Restrictions passcode to proceed.
  6. Tap Reset All Settings again to confirm again.

After the reset, try to open the Mail app and then send a test email message to see if you are now able to send it without anymore alert or error message.

Other Options to consider

  • Try other email apps.If the problem occurs on the Mail app, you can try to determine whether or not it is an isolated issue on the iPhone Mail app. To do so, try to use web-based emails or other email platforms like third-party apps then see if you’re still getting the same error. If not, then that’s a problem on the Mail app.
  • Also try to update your iPhone to the latest iOS version available. If that error appears to be a minor glitch on the current iPhone system, it will likely be remedied by an iOS update.
    • To check for available software updates for your iPhone, head over to Settings-> General-> Software Update. If an update is available, you will see a notification. Before you download and install the update, backup your iPhone.

After doing so, you can update your iPhone 6s Plus to the version of iOS wirelessly or manually using iTunes.

  • To update wirelessly, just tap the Install Now option from the update notification prompt then follow the onscreen instructions to complete the iOS update download and installation on your iPhone.

After updating the iOS on your iPhone 6s Plus, try to send an email and see if it is already working properly.

Seek More Help

If none of these methods worked for you and that your iPhone 6s Plus still says it “cannot verify server identity” each time you try to send an email, then you should now consider raising the issue to your email service provider. Otherwise, contact Apple Support for other options and recommendations.

Connect with us

We are always willing to help fix your problems with your Apple device. Browse through our existing troubleshooting posts or you may contact us directly by completing this form and hitting the Submit button. Make sure you provide all the necessary information about your phone and the problem so that it would be easier for us to help you.