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Gmail gives you another option - separate using dots.

g.uerillaclick@gmail.com

The number of options is of course limited but it's still recognized as a separate address while still coming into the same inbox

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I've built a few registration systems and always normalize email addresses (remove local part, de-dot gmail addresses) at signup and login.

It helps users who keep trying bobjones@gmail.com when they signed up with bob.jones@gmail.com. Also is pretty good at preventing mass signups using tricks like this.

How do you know where the local part starts? Google uses '+' but nothing stops you from using '-' as a delimiter if you're running your own servers.

Also, how do you deal with spam filters that are designed to spam anything without a local part? Or is this only done to "well-known" domains like gmail.com?

>if you're running your own servers.

This is enough of a threshold probably.

Actually guerilla.........................click@gmail.com would work too, since it fully ignores dots. So the options are just as (not) limited as anything a + can add.

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