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On Tuesday our Smartermail server (hosted at Amazon) crashed. After two hours on the phone with support the server was back up and running. Thank you AWS support. The only difference was the private IP address.
Since then I have received several complaints that email from regular clients were suddenly being marked as spam. Looking over the delivery log I noticed the only "failure" in Spam check results was: [_SPF: Fail]. the number of "failures" shows a definite pattern.
DATE COUNT of lines in delivery log
08-26 3039 (Crash day)
08-28 1213 (Disabled SPF in AntiSpam Administration)
Can anyone help me understand what happened? Why the dramatic spike in SPF fail? What to do about it? What to do next?