If you launched Mail app on iPhone or iPad after updating to iOS 13 or iPadOS 13 and now discovered new emails are showing up as “No Sender” and with “No Subject”, then you’re certainly not alone. This appears to be a known bug impacting a fair number of iPhone and iPad users after updating their devices to the various new iOS 13 and iPadOS 13 software releases, including iOS 13, iOS 13.1, iOS 13.1.1, iPadOS 13.1, and iPadOS 13.1.1.

If you’re impacted by the annoying Mail app “No Sender” and “No Subject” email bugs, then read on to learn how you may be able to troubleshoot and resolve the issue.

Troubleshooting “No Sender” & “No Subject” Mail Bugs in iOS 13 & iPadOS 13

The following steps may resolve the Mail bug where new email messages show up as having “No Sender” and the emails also show “No Subject”.

1: Force quit Mail app

First you’ll want to force quit Mail app.

How you do this depends on the iPhone or iPad model and whether or not it has a Home button.

• To force quit Mail app on iPhone & iPad models with Face ID and without home buttons, swipe up from the bottom of the screen and hold the swipe until the App Switcher shows up. Navigate to the Mail app and then swipe up on Mail app to push it off the top of the screen to force quit Mail app.
• To force quit Mail app on iPhone and iPad models with Home buttons, double-click the Home button to bring up App Switcher, then navigate to Mail app and swipe up on it to push it off the top of the screen to quit.

2: Force Restart iPhone or iPad

Next you’ll want to force restart the iPhone or iPad.

Again how you force restart the device depends on the iPhone or iPad model:

• For iPhone 11, iPhone 11 Pro, iPhone 11 Pro Max, iPhone X, iPhone XS, iPhone XR, iPhone XS Max, iPhone 8, iPhone 8 Plus, and iPad Pro (2018 or later): Press Volume Up, press Volume Down, press and hold POWER / WAKE button until you see the  Apple logo on the screen
• For all iPad models with Home button, iPhone 6s, 6s Plus, iPhone SE: Press and hold Home button and Power button until you see the Apple logo on the screen

After the iPhone or iPad has force restarted and booted back up again, re-open the Mail app and you should find that at least new emails arriving will no longer show up as “No Subject” and “No Sender” in Mail app. Some interim emails may still appear to show as “No Sender” and with “No Subject” however, which appears to show some persistence of the bug for emails that were already downloaded and labeled that way.

3: Update to the latest iOS version

If possible, update to the latest iOS release in Settings app > General > Software Update

Updating to the latest version of iOS available may or may not resolve the Mail app “No Sender” and “No Subject” bug for some users.

For some users, updating from say iOS 13 or iOS 13.1.1 to iOS 13.1.1 may resolve the issue, but for others (like myself) the “No Sender” and “No Subject” bug didn’t appear in Mail app until after updating to iOS 13.1.1. For example, my personal iPhone did not experience the “No Sender” and “No Subject” Mail bug until after I updated to iOS 13.1.1.

Nonetheless, presumably a future iOS update will resolve the “No Sender” and “No Subject” Mail app bugs, so checking for available iOS updates and installing them is always a good idea.

As always, be sure to backup your iPhone or iPad before installing any system software update.