Re-engagement campaigns

Re-engagement campaigns

I want to create a series of re-engagement campaign for an opted in mailing list, the list is about 14K, i was thinking about staggering the list out in order to not send too many mailings to the list. 

Do you guys have any suggestions as my main concern at this point will be the bounce rate. 
Which I noticed the system does not seem to distinguished between Hard and Soft bounces in the reporting.


Do you have any case studies on these types of mailings?

What have some of your current clients done?

What the best way to go about this using Zoho to achieve this? I do not want to lose my list. I've already checked it against my currrent DNC and BL in ZOHO.  

Thank you in advance