For my domain (manstadskolekorps.no), I'm having some issues sending mail from our web site to addresses on the manstadskolekorps.no domain.
Sending mail to addresses outside our domain works good but when sending email to addresses within the domain, the email client succeeds in sending the mail, but I end up receiving an email from the server with the following error message:
I've been searching for a solution but it seems impossible to find a solution because there are so many people getting this error message because they've forgot setting up authentication.
MX records:
- mx.zoho.eu
- mx2.zoho.eu
- mx3.zoho.eu
SMTP server:
The web server is authenticating when sending mail.