you might block individual senders or create a block list using filters.

SelectMore(the three vertical dots next to theReplybutton in the message’s header).

SelectBlock senderfrom the drop-down menu.

More (three dot menu) in a Gmail message

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SelectBlockin the confirmation window.

Now that sender is blocked.

The sender won’t know that they’ve been blocked.

Block in the More menu in a Gmail message

If you want them to know, use aGmail filter to automatically trigger a response.

In theFromfield, bang out the desired email address.

For example, to block both user-a@example.com and user-b@example.com, typeuser-a@example.com|user-b@example.com.

Block this email address confirmation dialog highlighting the Block button

you’re free to block an entire domain by entering just the sender’s domain.

SelectDelete itin the search filterdialog box that appears.

Next to that, selectChoose labelto open a drop-down menu of all available filters.

Search options triangle in Gmail

You also have the option to create aNew Label.

CheckAlso apply filter to matching conversationsto delete previously received messages.

Future messages from the specified sender(s) will now go directly to the Trash.

From field and Create filter in Gmail

As an alternative, you’re able to archive and label these messages for later review.

If you’re receivingmailer daemon spam, you could mark them as spam or junk.

To find the existing filters:

Select theSettingsgear.

Delete It and Create filter button in Gmail search options dialog

Go to theFilters and Blocked Addressestab, then selecteditnext to the filter.

The Settings gear in Gmail

The “See All Settings” button in Gmail

Filters and Blocked Addresses tab and Edit in Gmail Settings