By your experience, have you found that there is a campaign fatigue or attention span to respect when planning a service awareness or enablement campaign? What factors do you consider when making your call?
Never got a response on this one but let me share my experience a year later...
I have found that campaigns of 6 mailings are best. While it may differ with audience, I found that after 6, we tend to have drops. As well, for doing the maintenance of the campaigns, 6 is the magic number - it makes it manageable!
We have campaigns (mail chains) up to 12. By far, 6 is my preference.