Not sure, but most likely you won't be able to send all 200k at once, if you'll rent your own server - the servers warm-up process will take few months minimum.
Finding a good server with great reputation is what you need.
You probably already know but its best to use a throwaway domain than harm your primary one. make sure your domains aren't/dont get blacklisted as spammy if its an extended campaign
Edit - Assuming these are cold emails, if not then no need to worry
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