Unable to receive emails

Hi, I set up two new email accounts for my domain, updated the MX, and added in the SPF text. I can send an email through the Zoho mail app, but when trying to email the new address or respond to the email that I sent from Zoho, I receive the following messages:

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain theinternetassistant.com by smtp.secureserver.net . [72.167.238.29].

The error that the other server returned was:
550 5.1.1 < contact@theinternetassistant.com > Recipient not found. < http://x.co/irbounce >

Technical details of permanent failure:
Google tried to deliver your message, but it was rejected by the server for the recipient domain theinternetassistant.com by smtp.secureserver.net . [72.167.238.29].

The error that the other server returned was:
550 5.1.1 < breanna@theinternetassistant.com > Recipient not found. < http://x.co/irbounce >

Please help!

Thanks,

Breanna