Hi @Sharpsburgian and all,
Thank you for reaching out to the Community!
I understand that your sales emails are going to spam and this can be frustrating.
The reply that @karstenkoehler shared is great and very useful. It is directed to all Community Users, so it may indeed include solutions for free users as well as for users with paid subscriptions.
I can confirm that connecting the email sending domain is only possible in premium versions of HubSpot.
However, I’d like to share these resources that might help you:
- The solution from @Zakiya on this post “Emails sent in hubspot goes to spam”
- The solution from @aliciaw on this post “Hubspot emails going to SPAM”
- The solution from @CHansen7 on this post “emails going to the spam box”
If you have issue connecting your domain to HubSpot, can you please share screenshots?
The more info, screenshots (without sensitive/confidential information), and details you can provide, the better the Community can assist.
Here is an article that might help you “Troubleshoot your domain connection”.
I also wanted to invite a couple of subject matter experts to this conversation @Ben_M, @AdamLPW and @NicoleSengers, doy ou have any tips to share to help @Sharpsburgian, please?
If anybody else has anything to add and/or share, please feel free to join in the conversation 
Thank you and have a great day!
Best,
Bérangère