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I do it, and have done it for a pretty long time. In the vast majority of cases, it's (almost) in the form of sitename@myemailaccount.com - which is usually pretty easy to remember.

If someone was directly targeting me, and had my email address from another site, they could probably figure out what I'd used elsewhere. But if it's just a script running through email addresses harvested from site A, then mine will almost always be irrelevant on site B.

The main reason I use it though is that it's a great way to figure out where spam is coming from. Last week for instance I got a "male enhancement" spam from an email address I've only ever given to scan.co.uk. That addres is now on my block list and I doubt I'll be buying through them again.

Nice way to find where spam comes from.

Sadly this is at best a complicated workaround, that will will work for people that are motivated enough to remember for each different service a separate email and password and additionally to this you have to remember as well the credentials to manage your email address and check the emails from different sites.

In my case it would mean having about 100 email addresses.

You actually don't need separate emails for this. You can use (name+tag@provider.com, Gmail supports it and others too I'm sure). Or you can use your own domain (Google Apps makes this really trivial) and have the part before @ be the sitename (that's what OP suggests) and then have catch-all address. You might receive slightly more spam if you turn on catch-all, but I have a setup like this a it works.

I suspect my total is way above 100. But you don't actually need to remember anything really. The @mydomain.com stays static and the email is basically the name of the site.

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