Basecamp: DNS Setup allows sending mail on behalf of other customers

Sent on your behalf I knew basecamp themselves had used helpscout for support, so I was curious to see if hey was doing the same. A quick DNS lookup gave me the answer I was looking for: dig hey.com txt ; DiG 9.10.6 hey.com txt ;; global options: +cmd ;; Got answer: ;; -HEADER DiG 9.10.6...