Leasons learned from implementing DMARC(SPF/DKIM) on multiple domains
SPF Make sure your SPF records is valid. I have used: https://www.kitterman.com/spf/validate.html - mostly to validate records before…
Posted on February 17th, 2019
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_Format) MIME (https://en.wikipedia.org…
Posted on January 5th, 2018
Debugging 'The message failed SPF checks' when everything looks fine
So the other day we had a customer who complained that they were not able to send us mail because we blocked there emails because of SPF…
Posted on January 5th, 2018