I recently moved from Pardot to Marketo and I'm seeing extremely poor deliverability on known-good lists containing subscribers with recent activity. Doing a blacklist check on the sending IP, I'm seeing it on some lower-priority blacklists, which is never a good thing. Further testing is seeing similar problems on other IPs in the pool. Apparently I'm unable to move to a more premium IP pool until I've been a subscriber for a longer time, but I'm afraid that in the interim my list will be burnt by spam complaints and bogus filter-generated hard bounces.
Am I running into particular Marketo "bad weather" for the shared pool, or is it always this bad?
Is there an option to move to a different shared pool or is it all aggregated?