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Old 20th May 2010, 12:41
till till is offline
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One possible problem that I see with using a dns query is that someone else might be able to use the webmail for emails that are not hosted on servers of your company. You might prevent that by e.g. providing a list of allowed mailserver IP's or mailserver hostnames, but then the complexity gets to to a similar level then doing a sql query.
Till Brehm
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