MailCow as an unauthenticated Smarthost

Summary

I like to set up MailCow as an unauthenticated Smarthost since my system doesn't support any kind of authentication and only works as IP.

For example, If MailCow has the option to allow particular IP to send mail from any address of its verified domain, can I able to add the IP address of my system so I can send mail from it?

Some Printer and Legacy devices got the such options and they need IP-based authentication.

Motivation

I'm trying to use Google Workspace and it got daily limits for sending bulk mail. To bypass Google Workspace limits I can use MailCow SmartHost as an Outbound relay so it can send unlimited mail through the Mail Cow server. This also works with other providers like Zoho Mail, Office365, etc.

Additional context

No response

Have you found a way to do this?

You could achieve this by just using postfix or exim4, you don't need a whole mailcow setup for this which is aimed at properly authenticating mails AFAIK. Or if you already have a mailcow running for the rest of your mail, you could expand your postfix configuration as explained here: https://docs.mailcow.email/manual-guides/Postfix/u_e-postfix-extra_cf/ and probably whitelist your IP to send from.

There is a docs for this: https://docs.mailcow.email/manual-guides/Postfix/u_e-postfix-unauthenticated-relaying/. Hence, closing.