PayPal requires no email address verification.

I have the email address pwelch@gmail.com.

Every P. Welch in the world seems to be under the mistaken impression they have the email address pwelch@gmail.com.

PayPal has no mechanism for the legitimate owner of a given email address to stop people from registering PayPal accounts on that address, or to fix it afterwards.

Aside from that annoyance, I haven't had any problems with them.