On my website, members can send messages to each other, the message is sent directly to the member's email address, I'm worried that some members can send spam to other members (I have a basic spam filter in my site but there's no guarantee it will detect all spam messages) and since the mail is sent from my site's domain I could get my domain blacklisted in free mail providers like hotmail, yahoo, gmail .. etc, any suggestions how I could avoid this?
I thought about sending the mail from a randomly generated email address that doesn't exist, e.g. 0fcc717f-43f9-4dbc-99ad-166bb22f1c2b@mysite.com (using a guid), so that if the address gets blocked it shouldn't be a problem as it will not used again anyway, how effective is this in your opinion? will my whole domain be blocked if any spam sent from it?
Thanks for your suggestions ...
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