Yes, you can.
The emails you send using the task-specific email will be sent as if they were your email address. The receiver will see the sender as the [email protected]
account and if they reply to your email, it will be sent to that address.
The accepted answer to Gmail: Reply as task-specific email address the message was sent to (the +trick) shows you how to set it up to be a sender email. Please follow steps 1-6.
Note: an informed receiver could infer that your original email account is the left side of the +
character plus the @gmail.com
(plus the domaine.g. [email protected]
), but the email app won't (unless it was specifically developed to handle this).