If one doesn’t know the password is it an issue? I’ll look at those but mainly I cannot reach those websites (customer uses them for mail). Thanks.
It is quite standard today that companies have support only “for their own customers”, not for other people that do not have an account and just have a problem with them.
Anyway, I assume that all the way with “The ip is still being blocked by yahoo.com, aol.com, etc” you actually mean that you cannot send mail to those domains, not that you cannot access their site.
You will just have to live with that. Transferring e-mail is not for the beginning sysadmin. It will take you a lot of effort to cleanup the mess you (or other people who managed your router) have caused in the past.
Better tell your users that e-mail is being replaced by other communication methods and you cannot support it.