SMTP Email Help

[M3NTA7]

Hello Everyone,

I am using the SMTP that comes with IIS 6 to send the AC7 emails. most of them are fine, but about 5 to 10% get bounced back with similar errors. The FROM email address I am using resolves to a different IP address, so I'm guessing it has something to do with when the email recipients server does a reverse DNS lookup and finds that the IP of the SMTP server doesn't match the MX record? The main mail server is a different remote server than the web server. I hope I'm making some sense. Any ideas on how I should configure the SMTP? Or any other ideas?

Here are some examples of the errors:


There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<server31 #5.5.0 smtp;550-5.7.1 {mx007} Sorry, your helo has been denied.>

------------------------------------------------------------------------------------

The recipient could not be processed because it would violate the security policy in force

<server31 #5.7.0 smtp;550 5.7.0 HELO server31 argument must be a FQDN or IP-domain literal (k1SEj0243484113700)>



Thanks,
Glen

[AbleMods]

SMTP 550 usually indicates a spam block on the outbound IP address of the SMTP server you are using.

Do an RBL check on your outbound SMTP server, it might be blacklisted

After that, it could be many things. If you're pushing too many emails in too short of period of time to the same host, they'll tarpit you or flat-out block your IP.

Hopefully it's just a onsey-twosey situation.

The other thing to check would be that the ISP hosting the IP block of your outbound SMTP server has reverse-DNS configured properly to point back to your mail server FQDN.