Mail configuration in not working in Production.

Hi,

We are using SAP ECC6 with EHP 3 version with MSSQL2005 DB and WINDOWS2008r2 server.

For sending mails from SAP , we configured SCOT and SMTP configuration in all servers like DEV,QAS and PRD.

When i am sending mail from DEV and QAS its working fine, but in my PRD server mailis not going.and its giving below error message

Message cannot be transferred to node SMTP due to connection error (final)errior message number 816

all the configuration done as per the SAP standard document only, and its working fine in DEV and QAS.

below i am giving all the profile information and scot configuration ,SMTP port information and all..

Please check and help me to resolve this error.

This same parameters working in DEV and QAS...same parameters are there in PRD also.

Please check and help me.