I've had some luck using Postfix to relay emails sent to my server to multiple GMail accounts, but now I would like to go the other way around.
That is, use the gmail
"Add another email as your own" SMTP configuration feature in order to allow me and another user to send emails under the domain associated with the server. I haven't really found a clear answer on how to do this or what the issues with this setup are. Would appreciate any pointers on this.
I am using Debian hosted on Digital Ocean.