IMSS 7.1 - some fine tuning steps

q. You might get 550 Access denied - Invalid HELO name from receiving domain (certain domain only) What fine tuning need to be done?

a. There are few things that you can check. First, verify that your MX record has reverse MX record. Some receiving domain will check for this and if you don't comply you will be rejected.

Please refer below for configuration that you might want to fine tune:

1. http://esupport.trendmicro.com/Pages/Receiving-mail-server-replies-with-504-5.5.2-machinename-Helo-command.aspx

2. http://esupport.trendmicro.com/pages/Bogus-HELO-name-used-and-HELO-command-rejected-errors-appear-on-outbou.aspx

3. http://esupport.trendmicro.com/pages/InterScan-Messaging-Security-Suite-IMSS-for-70-Windows-is-unable-to-de.aspx

If you have tried all, but still the problem persist do escalate and make sure you attach together tsmtpd.ini, log.imss and tsmtpd.log in debug mode.

Note: To enable debug you can use CDT else login to IMSS web console Choose Logs > Settings from the menu. Application log level option change to "debug". Replicate the issue. Don't forget to disable the debug option once done.

Reference link for basic info and troubleshooting:
http://esupport.trendmicro.com/Pages/IMSS-70-Windows-basic-info-and-troubleshooting-guide.aspx#P25_1130