progress
Codebase-researcher finding 2026-04-16: the via candymail.com tag is controlled by the sendmail_via_candymail bitmask flag (separate from DKIM, email_settings, and white-label add-ons). Authors completed DKIM + custom domain setup but emails still routed through CandyMail. Re-pointing scope: verify (1) what conditions cause sendmail_via_candymail to be true vs false for a given client, (2) whether merchants who complete DKIM setup get their flag flipped automatically or whether it's a manual config, (3) what surfaces still show 'via candymail.com' even after the flag is correctly set. This is now the actual scope for Glenn's team.