Hello @Gotcha since the emails sent are sales and/or one-to-one emails instead of being sent through a connected inbox, in this case, your email provider is actually the sender in this case.
I also wanted to share this blog offers some tips to prevent your emails from going to spam. It discusses some tips such as don’t use all caps in the email’s subject line and offers a list of spam keywords. Click here for more information.
Please note since one-to-one emails are sent by your external email client, there is limited troubleshooting that can be done from HubSpot’s side; however, I recommend following some of the tips in the blog post to make sure the wording or format of your email is causing it to go to spam.
Do you know the sending reputation of your domain? The email could have been placed in spam based on the email sending reputation. As a recipient, you can drag it to your inbox, open it and click on it so your email client “learns” that it should be placed in your inbox.
I hope this information helps.
Pam