kbxscore
(Here’s an updated version of a post from way back in 2018, with additional resources! I hope you find it handy.)Need a tool to parse message headers? Trying to break down how long it took to hand off an email message between servers? Want to check for blocklistings, content scoring or link issues? Here’s a few different tools that do a few different things.First, let’s check message headers using this tool from Google, or this (I think unofficial) version for Microsoft headers. Both do basically the same thing — you paste in the email headers and it will parse them, giving you a breakdown of how much time it took between each server hop. Very handy for troubleshooting delivery delays. Did a Gmail server hold on to your message for four hours before passing it on? Or did it never leave your ESP’s mail server? That’s what tools like these…