Your POP3 server name is the name of the server that holds incoming emails in your mailbox. POP3 stands for Post Office Protocol 3, and it is a standard email protocol used for receiving incoming emails.
To locate your POP3 server name, you need to open your email client application, go to the email account settings, and find the incoming mail server settings. The POP3 server name usually starts with "pop" followed by the name of your email service provider. For example, if you are using Gmail, your POP3 server name would be pop.gmail.com.
If you are setting up a new email account, you can usually find the POP3 server name and other information on your email service provider's website or help center. In case you're still facing issues, you can also contact the customer support of your email service provider who will be able to provide the relevant information.