Is there any way to use Proxy for SMTP server?


Feb 28, 2022
There is one guy offer me a service, that he will config the SMTP server for me, he will using PowerMTA.
He asked me to buy VPS and a rotating reverse proxy - this is proxy API- plan.
He said the email will be sent from: My main IP --> Proxy IP (will be rotated every 1 hour) --> Clients, so that the Main IP will not be reported, or blocklisted.
He guaranteed that he will set up the full set rDNS, SPF... and make sure the email will get 10/10 score after setup.
My question is:
Technically, is there a way to set up like that?