Google today is rolling out a Gmail update that lets you block an individual's email address and unsubscribe more easily from a mailing list.
In both the browser and Android versions of Gmail, you can now block specific email addresses. Once blocked, the sender's messages will go to your spam folder. (You can always unblock the sender if you want their messages to show up again in your inbox.)
In the Android Gmail app, tap the Action overflow menu (the three vertical dots) to the right of a sender's name in an open email to block the sender.
In the browser version of Gmail, click the More button to the right of the user's name and select Block.
In the browser version of Gmail, you can already unsubscribe from email lists by clicking the Unsubscribe button to the right of the sender's email. Now you can also unsubscribe in the Android version of Gmail. To unsubscribe, tap the Action overflow menu in the Action bar and select Unsubscribe.
The update should be available today for the browser version of Gmail and should appear in Android over the next few weeks.