Those are not the server setting. Please post complete error messages and also the SMTP server settings, which are at account settings pane and scroll down left side to 'Outgoing Servers (SMTP) '

Ok. I have new screenshots to show you.

Ok, the error messages show missing DKIM and SPF records. That is not unusual for self-hosted private domains and indicates that the email host needs to make adjustments to the server for that protection. This is something you cannot do. However, you never shared your SMTP server settings, which might also be the culprit. I will be better able to give feedback if you post that pane. Thank you.

I thought I did take a screenshot of the outgoing server settings unless you mean from Homestead.com.

Ok, it seems the issue is not the SMTP server, but the DKIM and SPF settings on server. Most users ask their email provider to make that correction, and that is my suggestion, unless you feel comfortable dealing with that. It is a topic too technical for this forum.

Thank you. I will try to have Homestead fix it.