#5.5.0 smtp;521-EHLO/HELO error when sending emails to Comcast.net or aol.com
Posted on 2006-06-29
Background info: we have one server which has Windows Server 2003 SB...we are using Exchange internally only (for shared calendar, contacts). Our ISP is still hosting our email and I have set each user up in Outlook with their Exchange account as well as their POP3 email account.
So, in brief, the emails are coming and going thru the pop account, but are being stored in an exchange account (for backup reasons, and because some users roam to different computers).
Does anyone know why emails sent aol.com or comcast.net keep on kicking back the following email?:
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator. <???.????.local #5.5.0 smtp;521-ECHO/HELO from sender ???????? does not map to ????.????.local in DNS>
I have read other posts, but I'm not sure they apply to me since we are not functionally using Exchange to send or receive emails.