Dennis Kjær and Jensen Free People Check 

( I'm Dennis Kjær)
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OWASP local meetup | Meetup

www.meetup.com
DMARC (and friends): Dennis Kjær Jensen (or just SiGNOUT) will tell you about DMARC, SPF and all the other email extending security features that you simply have to have enabled on your domain to not look to much like a fool now that it's and those vulnerabilities have been around forever now.
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