How to organize a mail server if there is no static IP?

Question

VPN

I changed my place of residence, and in the new area there is not a single provider providing a static IP. And I have a Synology NAS with a mail working mail server. I think to start up a mail traffic in the world through VPN. Accordingly, I need a VPN provider who will give me a personal static IP, to which I could attach my domain, website, mail and several services. On the one hand, I need good speed, I have a 100 megabit channel, a small ping, but on the other hand, I want to go outside of Russia, because I didn’t receive mail from some services before, and as it turned out, this most likely happened due to blocking from Russia . The main thing is that the channel is not blocked before the provider.
I didn’t particularly encounter tunnels, especially with foreign services. How to correctly build a system? Whether it is possible to start mail through tunnels in general? What services do you recommend? What are the pitfalls? What about security in this case? What scheme of work is acceptable in this case?
PS I also remembered that the main thing is that the provider can also make a correct PTR record corresponding to my domain name. Our providers do this only for legal entities.

Answer 1

It makes no sense to arrange such hemorrhoids with vpn.
It's easier to just take vps and put your email there right away.
And do whatever and how you want on it.

Answer 2

Too many questions :)
I would separate the services, putting half of them on a VPS, from which I would throw a VPN on synology. You can probably find a VPN with static. But it will most likely be paid.
JFYI: toaster is a question and answer service, step-by-step guides and analytics about which VPN has which features you definitely can’t find here (sometimes you can’t even find an answer to a specific question).