I just use a unique address for each service. Any email that gets leaked or is getting unsubscribe resistant spam is added to /etc/postfix/denied_recipients :)
Appending "+label" to the username part of an email address is legal and will be delivered to the username mailbox.
Doesn’t sound like a very fun hobby, TBH.
Appending "+label" to the username part of an email address is legal and will be delivered to the username mailbox.