Can you share what your antispam strategy is?

I have arrived at the opinion that what I would do if I moved to selfhost would just be to pay some trivial amount for outbound email via a provider like sendgrid as someone else in these comments has also mentioned. Since I send out maybe a half dozen emails a month I don't think this would be a big deal.

But when I relied on selfhosted email several years ago, I was always inundated with spam, which SpamAssassin was wildly undermatched to handle -- that was one of the main reasons I moved to gmail. So I'm curious what people who are happy self-hosting today are using.