Mail Mark As Read is a line-style Icon from Micro Line - Free set.

The Mail Mark As Read icon shows a rounded rectangular envelope with a folded flap forming a diamond-like opening. Drawn in the line style on a 10px grid with a 1px stroke so it stays clear at small UI sizes. Use it for email controls, read-status actions, inboxes, message lists, and mail applications. It belongs to Micro Line - Free set in the Micro family.