sending domain comcast.net does not pass DMARC verification

I am trying to send an email to a user @ splendidotucson.com.  It gets bounced back with a whole lot of coded information, and then the statements:

Reporting-MTA: dns;BN8PR04MB6419.namprd04.prod.outlook.com
Received-From-MTA: dns;sender4-of-o50.zoho.com
Arrival-Date: Thu, 25 Jun 2026 17:21:17 +0000

Final-Recipient: rfc822;[xxxxxx]@splendidotucson.com
Action: failed
Status: 5.7.509
Diagnostic-Code: smtp;550 5.7.509 Access denied, sending domain comcast.net does not pass DMARC verification and has a DMARC policy of reject.
X-Display-Name: [xxxxx xxxxx]