What is my imap password

When you set up your mail account (it is irrelevant if that was IMAP or not), you created a password with your internet provider for your Mail program. Youc an try and see if it is saved in Keychain access (in your Applications folder); if not, you may need to contact your provider and ask how to reset it with them.

You will need to seek assistance with recovery of your email password from your email provider. You will likely discover that your mail provider has a password reset webpage.