bouncing registration emails

[SeniorBuzz]

my forum piggybacks on another forum's server

the webmaster of the host forum is complaining that emails sent to my AOL account, during the registration process in my forum, are being rejected by AOL, and are ending up in his mailbox.

I've removed my email address from:
settings-options > site name / URL / contact details
change contact info.

according to the webmaster of the host forum the problem is allegedly continuing

thinking it has something to do with a plugin "quick registration via Facebook" that was added into my forum about six months ago, which, among other things, denies registration based on time taken to fill out the registration form.

my question is: is there an easy fix?

I don't want these emails in my AOL mailbox any more than the webmaster of the host forum wants them in his.

thanks for any help or suggestions