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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".

Office Update Error
18th Jan 2019

Microsoft Office Click-To-Run software can sometimes encounter an error during update.  "Something went wrong" and error code 30015-26. This seems to be because corruption has occurr...