How to check if mail has been delivered in gmail

There are a few ways to check if an email has been delivered in Gmail:

1. Check the "Delivered" label: In your Gmail inbox, click on the "More" menu and select "Show search options". Then, enter "delivered" in the "Has the words" field and click on the "Search" button. This will show you all emails that have been delivered to your inbox.
2. Check the "Sent" label: If you're trying to track the delivery of an email you sent, you can check the "Sent" label. Go to your Gmail inbox, click on the "More" menu, and select "Show search options". Then, enter "sent" in the "Has the words" field and click on the "Search" button. This will show you all emails you've sent, including those that have been delivered.
3. Check the email's status: In your Gmail inbox, click on the three vertical dots next to the email you're interested in and select "Show original". This will open the email's source code, where you can look for the "Delivered-To" header. If the email has been delivered, this header will contain your email address.
4. Use the Gmail API: If you're a developer, you can use the Gmail API to check the delivery status of an email. The API provides a "messages.list" method that returns a list of messages in your inbox, along with their delivery status.
5. Check the email's bounce notification: If an email has been bounced (i.e., it was not delivered to the recipient's inbox), you may receive a bounce notification in your Gmail inbox. This notification will indicate that the email was not delivered and may provide an error message explaining why.

Note that Gmail does not provide a built-in feature to track the delivery status of individual emails. The methods above are workarounds that can help you determine if an email has been delivered.