I have setup three domains with domain keys (_domainkey and _dmarc) records for three domains on my server.
All are setup the same, all have DNS records as needed.
When I test with online tools, they specify that all domains are configured correctly and the keys work.
When I send to gmail.com or outlook.com, two of the domains work perfectly and outgoing emails are signed.
The third domain, the emails are not signed and I cannot see why.
How can I find out where this is going wrong ?
Thanks