Custom Domain shared mailbox with Proton Family - best approach

[rallyn]

I have signed up for Proton Family account and have a couple domains, and need to figure out how to best do shared mailboxes. I am testing one domain, and added it to Proton intially, but now I am thinking I should have added it to Simple Login instead, which would allow shared logins to the shared mailboxes.

If anyone has a best practice on this, I would greatly appreciate guidance. This is a major hurdle to get over to adopt Proton. Enjoying the features, and privacy focus. Hoping to recommend it to all my family.

Any guidance appreciated.

[Wolf1098]

Their official guide would be to transfer the mx's from proton to simplelogin, but if you make some tweaks, can post them the spf and dkim work for both concurrently, not much point really... the only time simple login won't be passing stuff to protonmail. would be a laspe in subscription(CHEAPER) where the proton account would be also unable to receive