Which activity is used to get and filter mail messages

The activity used to get and filter mail messages is called "POP3" (Post Office Protocol version 3) or "IMAP" (Internet Message Access Protocol).

POP3 is a protocol used to retrieve email messages from a mail server to a local email client. When you use POP3, your email client downloads the messages from the server and deletes them from the server. This means that you can only access your email messages on the device where you downloaded them.

IMAP, on the other hand, is a protocol that allows you to access your email messages on the mail server, without downloading them to your local device. This means that you can access your email messages from multiple devices and keep them synchronized across all devices.

Both POP3 and IMAP can be used to filter mail messages using various techniques, such as:

Some popular email clients that support POP3 and IMAP include:

It's worth noting that some email providers, such as Gmail, also offer additional filtering and organization features, such as labels and filters, that can be used to manage and filter email messages.