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If I add a domain like Microsoft.com to the IronPort white list will it verify the email came from the microsoft domain or would I just give spammers a big hole to spam us?
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If I add a domain like Microsoft.com to the IronPort white list will it verify the email came from the microsoft domain or would I just give spammers a big hole to spam us?

IronPort whitelist

Various techniques are used to prevent email spam (unsolicited bulk email). No technique is a complete solution to the spam problem, and each has trade-offs between incorrectly rejecting legitimate email (false positives) vs. not rejecting all spam (false negatives) - and the associated costs in time and effort. Anti-spam techniques can be broken into four broad categories: those that require actions by individuals, those that can be automated by email administrators, those that can be automated by email senders and those employed by researchers and law enforcement officials.