The Sentry signup nobody could finish
A colleague signed up on our self-hosted Sentry and never got the email. I had been getting Sentry mail forever, so I assumed he was missing something. He was not. DMARC was silently dropping every message to our Workspace inboxes, and the 'workaround' I shared with him broke too. Here is the bug, the lie my inbox had been telling me, and the shell command that finally got him in.
sentryself-hosteddmarcsmtpops