[ATU/M/ISK]

I'm not sure if this is what you're asking for, but a neat trick to make an unlimited number of accounts on anything using only one e-mail is to just register with a random period (.) anywhere in the e-mail.

It'll register with the website as new, and you'll still get all the mail sent to the original actual e-mail address, and you can use as many periods as you want anywhere you want.

For example.

myemail@Gmail.com
m.yemail@Gmail.com
m.y.email@Gmail.com
m..yemail@Gmail.com
m.ye..mail@Gmail.com
m.y.ema........il@Gmail.com

All will register as new addresses, and all mail still goes to the original myemail@Gmail.com