[ekianjo]

with gmail you can do something similar without all that hassle. lets say your email is [e-mail] you can register any email as [e-mail] and Gmail will always ignore the + and route to your [e-mail] address.

[phire]

I'm sure anyone selling their user's email addresses will o know about this and strip out the + suffix from any gmail addresses in their list.

[RustingSword]

Some websites consider email addresses containing "+" as invalid.