Hey Alex - when you say "from what I can tell", what are you looking at?
A few things to check:
- Are these net-new emails that these 500 people have definitely never been sent before? (create a smart list to be certain)
- Are the 500 people definitely members of this stream? (again, create a smart list to be certain)
- Are the 500 people definitely not paused? (again, smart list!)
- Are these 500 people marketable? (create a smart list to ensure there aren't data reasons for them not receiving - marketing suspended, unsub, etc).
Start here - if you can be certain that none of the above explain the lack of sends, then dig further.
Well, I feel both stupid and smart...
While I was continuing to debug the issue, the emails started flowing. It turned out I did do everything correctly.
I created the campaigns last week, but I had pushed the start date out to late afternoon yesterday.
So, looks like all is well!