Since iOS 7, it is now very easy to mark all emails as read or unread on iPhone. Sometimes when you’re suffering from email overload on iPhone, you can simply use this new Mark All option to select all emails and mark them as read. On the contrary, you can also use the Mark All to select all emails and mark them as unread on iPhone. If you like to mark multiple emails as read or unread on iPhone, you can simply select them manually with a tap one by one, then mark them as read or unread.
Mark All Emails as Read on iPhone
Open Mail app on iPhone,
Tap on “Edit” in the upper right corner
Now you will find the Mark All option on the lower left corner. You can tap on it to select all emails and mark them as read or unread on iPhone.
If you only want to select some emails, tap to select emails one by one, when an email selected, you can see the empty cirle in front of it changes to a check icon with blue background.
When you have selected multiple emails, tap on the Mark option on the lower left corner to mark them as read or unread on your iPhone.
You can select as many emails as you want and mark them as read or unread in just one time.
Extra Email Selection and Mark Tips for iPhone
The above instructions can be applied on various iPhone models as long as they are running on iOS 7, like iPhone 5s, iPhone 4s, iPhone 5, etc. iPad users can also use this method to, mark multiple emails as read, etc.
The Mail app for iOS allows you to search mails on iPhone, you can make use of this feature to quickly search and bulk messages and mark them as read or unread. For example, you can search and mark emails from a particular sender or search and mark bulk emails containing specific keywords.