1 of 1 people found this helpful
Can you add all the addresses to a static list and include it in every Smart List of all email campaigns?
Also ensure communication limits are appropriate.
The point about communication limits is very important as you cannot override it unless you override it for all campaign members.
Keep in mind that all these leads will have to be unsubscribed=F, invalid=F, black listed=F, and not suspended. So if someone leaves the Org and you didn't update the list, Marketo will get the bounce.