You definitely need static addressing, dynamic address pools are generally listed on RBLs.
Many spam filters will also automatically assign a score or even reject immediately for a lack of reverse DNS, irrespective of anything else you might have in place.
You *might* be able to use an upstream SMTP server provided by the ISP or a third party to deliver outbound mail rather than doing it yourself. Inbound should be fine.
I'm not aware of any ISPs here which provide reverse DNS control, even for customers with static addressing. You might be able to ask and see what they say.
Running a mail server at home is great from a privacy standpoint, but you need a cooperative ISP, and mass market providers generally won't go out of their way to serve a small niche like this.
The other option is to rent a cheap VPS and run a mail server there, although that sacrifices the privacy aspect since it's still someone else's server in someone else's datacenter.
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