Hi Randal,
Rami’s point on acquiring contacts is very important and it looks like you are going right about it.
However, contact decays at a rate of 35% every year (Database Decay Simulation). Therefore, email hygiene periodical check-up is essential to make sure you eliminate invalid emails before your email marketing. Email hygiene should also give you recommendations about how you use the emails depending on their quality so you can avoid your valid emails from bouncing back. Check this test link to give you an idea (https://info.myebcard.com/test-your-contact-data-quality).
Let me know what you think.
Many thanks,
Elias R.