How to check mail seen or not

There are a few ways to check if an email has been seen or not:

Method 1: Check the email's "Read" status

Most email providers, such as Gmail, Outlook, and Yahoo, display a "Read" or "Unread" status next to the email subject. If the email has been read, it will typically be marked as "Read". If it hasn't been read, it will be marked as "Unread".

Method 2: Check the email's "Open" or "Viewed" status

Some email providers, such as Gmail, offer a "Open" or "Viewed" status that indicates whether the email has been opened or viewed. This status is usually displayed in the email's header or in the email's metadata.

Method 3: Check the email's "Tracking" or "Read Receipt" status

Some email providers, such as Outlook, offer a "Tracking" or "Read Receipt" feature that allows you to track whether an email has been opened or read. This feature can be enabled or disabled on a per-email basis.

Method 4: Check the email's "Metadata"

Some email providers, such as Gmail, store metadata about each email, including information about whether the email has been read or opened. You can access this metadata by using the email provider's API or by using a third-party email client.

Method 5: Use a third-party email client or plugin

There are several third-party email clients and plugins available that offer features to track whether an email has been read or opened. For example, Boomerang for Gmail is a popular plugin that allows you to track whether an email has been read or opened.

Method 6: Use a email tracking service

There are several email tracking services available that allow you to track whether an email has been read or opened. For example, Mailtrack is a popular service that allows you to track whether an email has been read or opened.

It's worth noting that some email providers may not offer these features, or may offer them only for certain types of emails or accounts. Additionally, some email providers may have restrictions on using these features, such as requiring you to have a paid account or to use a specific email client.