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Sender Policy Framework (SPF) is an e-mail validation system designed to prevent e-mail spam by addressing a common vulnerability, source address spoofing.  Domain Name Service (DNS) records for a domain include an SPF record that identifies which servers can legitimately send email originating from the domain.  Receiving email-servers check such DNS records as email is received, and reject emails that do not come from the specified source.  Although used quite widely, by no means all receiving email-servers check SPF records.  An email that is rejected by such a check usually carries a 550 error reference, with wording similar to "Sender Verify Failed".

USB3.0 for HP Proliant Gen8 server
26th Feb 2017

Recently had something of a struggle trying to find a USB 3.0 card to work in an HP Proliant ML350p gen8 running Windows Server 2008R2. A solution that has worked uses a Startech 2 Port PCI Express...