Why did a contact not get the email?
Work down this list; the answer is almost always in the first two steps.
- Activity → Dispatches, filter by the contact. No row at all? The HubSpot workflow never reached the mxAURA action; check enrollment and the workflow in HubSpot.
- Row says blocked? Fix the reason (sender, branding, reconnect, enabled).
- filtered? The pool's filter excluded them.
- no message? They have had everything; add messages or use a recurring pool.
- success but nothing in the inbox? mxAURA's part is done; check the HubSpot email's send log, the contact's subscription status, and spam.
Simulate on the campaign shows what they would get next.