Recently some members of my staff started receiving bounced email messages. Specifically, the error below:
Your message did not reach some or all of the intended recipients.
Subject: RE: How are yu doing
Sent: 11/17/2010 4:55 PM
The following recipient(s) cannot be reached:
email@example.com on 11/19/2010 5:06 PM
You do not have permission to send to this recipient. For assistance, contact your system administrator.
<Mail.mydomain.com #4.7.1 smtp;450 4.7.1 <Mail.mydomain.com>: Helo command rejected: Host not found>
How do i fix this?