Sending Email To nxxxx@erols.com Blocked

I can send to the address XXXXXX@erols.com from Gmail but not from Xfinity email.

Reporting-MTA: dns; mx01.rcn.email-ash1.sync.lan
Arrival-Date: Sun, 04 May 2025 11:06:54 -0400

Last-Attempt-Date: Sun, 04 May 2025 11:06:54 -0400
Status: 5.2.2
Final-Recipient: rfc822; xxxxxxx@erols.com
Remote-MTA: dns; md08.rcn.email-ash1.sync.lan
Diagnostic-Code: smtp; 552 5.2.2 Over quota
Action: failed

Please let me know if more information is needed.

Joe P