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Exchange, Exchange 2007, Exchange 2010, Microsoft, Office, Outlook 2010, Outlook Web Access, OWA, SBS 2011, Small Business Server 2011, Windows, Windows Server 2008 R2

Windows Server 2008 R2 – RTM and SP1 may not respond to a request for a Sender Policy Framework (SPF) TXT Record Correctly if it exceeds 512 bytes

12/11/2011 Stuart Davey

In this scenario if the Sender Policy Framework TXT record exceeds 512 bytes in size then you may find your server anti-spam fails to correctly identify e-mail as either legitimate mail or SPAM, this can result in the two extremes of SPAM mail being delivered to users or legitimate e-mail being rejected as SPAM.

Microsoft do offer a hotfix for DNS Server to prevent this issue KB 2495375 http://support.microsoft.com/kb/2495375

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