Also, if you host this sort of thing on a public cloud instance, it poisons the IP for the unfortunate souls who get it after you release it back into the pool.

Also, if you host this sort of thing on a public cloud instance, it poisons the IP for the unfortunate souls who get it after you release it back into the pool. I once had to troubleshoot why email notifications from a server of mine didn't work, and turns out the IP was already on several blacklists when it was assigned to me.