SMTP not sending mail

I have a dedicated server and until recently it worked just fine.
My SMPT will not deliver to my own domain.
My asp.net web app creates an email and sends it to a domain recipient email address but the email just sits in the queue folder. If I change the recipient email to my yahoo account or any other domain then
the email gets delivered no problem.
The error I eventually get is.....
Message delivery to the host 'xxx.xxx.xx.xxx' failed while delivering to the remote domain 'mydomain.com' for the following reason: An SMTP protocol error occurred.
The SMTP verb which caused the error is 'HELO'. The response from the remote server is '501 Syntax error in parameters or arguments
Would be grateful for any help

Hi,
Regarding the current issue, please first check what it's using for a DNS server. If you configure it to send to the Exchange server via a name rather than an IP address, then it may be incorrectly
resolving that name to a public IP. In addition, please also check the settings of the SMTP servers.
How to help secure SMTP client message delivery in Exchange 2003
http://support.microsoft.com/kb/823019
Configure MX Records for Incoming SMTP E-Mail Traffic
http://www.petri.co.il/configure_mx_records_for_incoming_smtp_email_traffic.htm#
In addition, the following article may also be useful.
What to Check When Exchange Cannot Send Email to Certain Domains
https://blogs.technet.com/b/sbs/archive/2008/01/03/what-to-check-when-exchange-cannot-send-email-to-certain-domains.aspx
Since it’s an Exchange related issue, I suggest you’d better ask in the Exchange forum. We will get a better assistance there.
http://social.technet.microsoft.com/Forums/exchange/en-US/home?category=exchangeserver
Best Regards,
Andy Qi
Andy Qi
TechNet Community Support

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