Email Not Being Received By Recipient

Emails we are sending are generally not being received. For some reason they are being blocked by the recipient's email host or they are landing in their junk folder. However, to test this, i frequently will resend a similar email to the same people using my yahoo address. This works perfectly every time.

Why are my homestead emails not getting through? I moved my domain to Intuit/homestead to be more professional but it is costing us a ton of time and money to simply communicate with our clients and vendors.

Thank you,
David