I would like to turn off the setting to only allow 1 registration from each email address, is this an option in the admin panel?

Thanks

why you need this feature ?
if it just for you on order to create users, use emails like
[email protected] - [email protected] etc..
and all comunications will be sent to your principal email account. ( this if you have a Cpanel and paied hosting).
If not, i am wondering why you will allow a user to register more than one account ?

file member.module.php

function signup

delete these lines or put // before each line

[code]
$res = sql_query("select * from ".tb()."accounts where email='{$_POST['email']}'");
if (sql_counts($res)) {
$errors[] = t('You have registered with this email address before.');
}
[/code]