Leasons learned from implementing DMARC(SPF/DKIM) on multiple domains

Leasons learned from implementing DMARC(SPF/DKIM) on multiple domains

Make sure your SPF records is valid. I have used: https://www.kitterman.com/spf/validate.html - mostly to validate records before publising them in DNShttps://mxtoolbox.com/Lookup published SPF/TXT…

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Debugging 'The message failed SPF checks' when everything looks okay

So the other day we had a customer who complained that they were not able to send us mail because we…

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MailScanner, RTF(Rich Text Format), Exchange, Office 365 and winmail.dat ... craziness

RTF was discountiuned in 2008 but still lives in the hidden(https://en.wikipedia.org/wiki/Rich_Text_…

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