How to clear mail data in iphone ios 11

To clear mail data on an iPhone running iOS 11, you can follow these steps:

Method 1: Delete individual emails

1. Open the Mail app on your iPhone.
2. Tap on the "Mailboxes" tab at the bottom of the screen.
3. Select the mailbox you want to clear (e.g., "Inbox", "Sent", "Trash", etc.).
4. Swipe left on the email you want to delete.
5. Tap "Delete" to confirm.

Method 2: Delete all emails in a mailbox

1. Open the Mail app on your iPhone.
2. Tap on the "Mailboxes" tab at the bottom of the screen.
3. Select the mailbox you want to clear (e.g., "Inbox", "Sent", "Trash", etc.).
4. Tap the "Edit" button in the top-right corner of the screen.
5. Tap "Mark All" at the top of the screen.
6. Tap "Delete" to confirm.

Method 3: Clear mail data from the Settings app

1. Open the Settings app on your iPhone.
2. Scroll down and tap on "Mail".
3. Tap on "Mail Days to Sync" and set it to "1 day" or "Off" to delete all emails.
4. Tap "Reset" next to "Mailbox Storage" to clear all mail data.

Method 4: Use the "Reset" feature

1. Open the Settings app on your iPhone.
2. Scroll down and tap on "General".
3. Tap on "Reset".
4. Tap "Erase All Content and Settings".
5. Tap "Reset" again to confirm.
6. Follow the prompts to reset your iPhone.

Note: Before clearing mail data, make sure you have backed up your iPhone using iCloud or iTunes, as this will delete all emails and other data on your device.

Also, if you're using a third-party email client, such as Microsoft Outlook or Gmail, you may need to clear mail data from within that app as well.