Before using the Adguard Temp Mail service, check to see if your own email provider offers the same.
I’m with Mailbox, and they offer temp emails, email aliases, and email extension (“+” to separate email addresses.
Side note, as a paying Adguard customer, I’m salty that they got rid of their active support forum. I will not go to Reddit or some third-party site to ask questions. Their support forum was really helpful for many years, and removing it is a massive step backwards.