I get messages like this:
(reason: 550 5.7.509 Access denied, sending domain [TALKTALK.NET] does not pass DMARC verification and has a ...D58215B256569] [BL02EPF0002992A.namprd02.prod.outlook.com 2025-03-01T09:35:26.857Z 08DD54C047B77357])
from a few of my contacts. Generally email sending works fine but just a few contacts won't accept. Is there anything i can change?
