You may find it annoying to have to individually mark every email on your iPhone (or iPad) as read. Here is how you can mark all of the messages in your mailbox as read or unread.
1. Launch the Mail app and see your mails (a blue dot means the message is unread)
3. Tap Mark All
4. And select Mark as Read or Mark as Unread
Related: Mac OS X How-to: Setting up your mailboxes on Mail
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Yasmin Wadia says
Go to “Settings”
Select “Mail, Contact, Calendars”
Select the mail account that shows the unread message.
Turn “Mail” to “Off”
Turn the iPhone / iPad off by holding down the power button for 5 seconds and slide to power off.
Wait for 30 seconds, turn the iPhone / iPad back on.
Go to “Settings”
Select “Mail, Contact, Calendars”
Select the respective Mail account
Turn “Mail” back to “On”