reply emails are being kicked back!

In February Google began requiring commercial senders and perhaps all senders to "authenticate" their email accounts in order to send to gmail and yahoo accounts. Sometimes individual emails go through, but when sending out a group email that includes gmail and yahoo accounts they often get kicked back or else end up in spam/junk folders. I made the mistake of going to the link the authenticate where it recommended that I open a Google Workspace account. I did, and in the process I lost my email inbox for my account hosted by Homestead through Roundcube.