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Re:Masked email from Fastmail and 1Password by smcleod on Tuesday September 28, 2021 @09:23AM (#28682461)
You can also do things like a wildcard on a subdomain like [email protected].

Otherwise subaddressing with + works well with most mail hosts other than Microsoft Exchange / Office365 (which have had endless problems).

Re:Masked email from Fastmail and 1Password by amadeusw on Tuesday September 28, 2021 @11:19AM (#28683831)
That's the way to go. I set up a rule where everything going to *@a.mydomain.com goes into a folder which I largely ignore. Every website gets a unique prefix, e.g. [email protected].

The advantage of Masked Emails is that third parties won't even know about mydomain.com. The disadvantage is that you need 1Password to recall which email address you used with a particular website.