I had a similar setup and account in my last organisation and it worked fine.
Secondly, all emails sent out through my Hubspot now are classified as spam or rejected bys some mail recipient servers.
@MNjue did you set up the sender address in your last organisation? How to do this is within the article linked in my initial comment.
If you set this up to come from your own domain this will help improve email deliverability, there’s also great advice on improving this on the knowledgebase here.