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Re: Registration email addresses
Unfortunately, abuse by spammers and hackers of disposable, free email addresses from hotmail, GMail, AOL, etc. is so widespread that many forums, including this one, have had to prohibit registrations using addresses from those and certain other domains. Since the system has no way of knowing which of the millions of addresses from those domains are legitimate and which are not, it must unfortunately reject them all.
Since the forum does not use your email address for any purpose other than registration, password retrieval, and only very occasional contact, you can be assured that an email address such as one provided by your ISP (Internet Service Provider) will not be shared with any other parties.