Present Simple – Is/am/are + Verb 3
The mail is read
Present Continuous – to be + being + Verb 3
The mail is being read
Past Simple – was/were + Verb 3
The mail was read
Present Perfect – Has/have + been + Verb 3
The mail has been read
Past Perfect – has + been + Verb 3
The mail had been read
Future Perfect – will have + been + Verb 3
The mail will have been read