Question : Communication problem between TrendMicro IMSS 7.0 and SendMail

We are using an Trendmicro IMSS 7.0 server to send & receive emails.
Ever since we have upgraded from version 6.0 we experience problems in sending out emails to "SendMail" mailservers. Apparently their is a new feature in these mailservers (Sendmail) that detects Ghost (Spamsending) computers according to the amount of mail that is send from a server and a specific communication speed. Trendmicro's IMSS 7.0 system is automatticaly seen as on of these Ghostmachines.
This means that if someone tries to send to a Sendmail server, this mailserver will reject the connection and after 8 hours, IMSS will generate an "Relay time-out" error message.
Does anyone have any idea in how to resolve this issue?

Answer : Communication problem between TrendMicro IMSS 7.0 and SendMail

I've received the following feedback from TrendMicro:

 Change the IdleWaitingSecond as follows:
- Go to &Program Files\Trend Micro\IMSS\ config folder.
- Open the tsmtpd.ini file with notepad.
- Search "IdleWaitingSecond=30" and change it to 60. Remove the "#" sign to enable it.
- Save the file and restart the IMSS SMTP/Scanner services.

 
 http://esupport.trendmicro.com/support/search.do?cmd=displayKC&docType=kc&externalId=PUB-en-1035704

I've already changed the IdleWaitingSecond into 90, but still no good communication.
What is de default setting for a SendMail?