How to mark all your emails as read in Gmail

You can mark all emails in your inbox as read on the desktop version of Gmail, or you can limit it to emails within a folder, ...

How to request and return read receipts in Gmail to see if your email has been read

Work and school Gmail accounts set up by an administrator have access to the built-in read-receipts feature. Otherwise, there ...
Ars Technica

Gmail, Mail and "mark all messages as read"

An annoying quirk of either gmail or Mail is that gmail inboxes don't seem to stay synchronized and the folders have the annoying numeric-bubble indicating unread emails. I constantly have to manually ...
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Gmail Trick: Here’s How to Tell If Someone Read Your Email

Waiting to hear back after sending an important email can be frustrating, especially when you’re unsure if the message was even read. Luckily, Google now has a feature to ease that anxiety, offering ...