Emails can’t be sent via my WHMCS installation. I’m using Namecheap’s Oxmail for my email service. The error message in question is:
Admin Email Notification Sending Failed - SMTP Error: The following recipients failed: email@example.com, firstname.lastname@example.org
SMTP server error: 5.7.1 : Sender address rejected: not owned by user email@example.com
(Subject: [Ticket ID: *] New Support Ticket Response)
- 12/08/2012 03:51 - Client - IP address
Does anyone have any idea what might be causing this?