The problem is most likely how your server is announcing itself. Nothing to do with blocklists or anything like that.
This is a setting on the SMTP virtual server in ESM.
ESM, Servers, <your server>, Protocols, SMTP. Right click on the Default SMTP VS and choose Properties. Click on the tab Delivery and then Advanced. In the box FQDN I expect it says something like server.domain.local. That will cause this error.
Change it to mail.example.com (where mail.example.com is the name that your server is known as on the internet, with matching PTR records etc - usually what is listed in your MX records as well).
Apply/OK out and restart the SMTP Server service in services.
Simon.
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by: darrellarbaughPosted on 2009-07-21 at 09:19:33ID: 24906391
Check your masquerade name in the Virtual SMTP Server (Properties - Delivery -Advanced) to ensure you have a match between PTR record for your IP and who you are saying HELO as. In addition, from the mail server itself, can you try a regular telnet session using port 25 and trying helo <enter FQDN of mail server here> and see if the session continues where you can enter "mail from:" and "rcpt to:". There is a great tutorial on how to manually test email connections from here: http://postmaster.aol.com/ tools/teln et.html