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There are good reasons to provide unique aliases to companies requesting an email:

- if they start sending you spam you can severe their capacity to contact you by deleting the alias

- if they give your contact to a third party, you know from the alias who leaked your email address

- if you see an email on a data breach like this one, you know immediately which website got hacked

- it makes it really hard to correlate your identity across two websites

I don't disagree with providing unique emails to various services, I just don't think that _randomstring_@your-domain.com is better than myspace@your-domain.com than. I actually think it's worse, since it's more difficult to identify when an email is coming from the wrong place. If I get an email to myspace@domain.com and it's not from MySpace, I know right away. That's not as immediately obvious if I get an email to a random string.

Agreed. And it's so easy to set up when you have your own domain, I'm somewhat surprised not more people are doing it. Oh well.

It would be cool if there was something like this built into a password manager

There is, it will save off whichever username you use when you sign up eg facebook@domain.com - works well for me.

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