SMTP error still appears after changing SMTP server

Hi

We have an RTC server which had communication problems with a SMTP server. It seems during some minutes communication was lost and an error appeared:


2015-05-15 16:46:35,901 [WebContainer : 41 @@ 16:46 <unauthenticated> /jts/service/com.ibm.team.jfs.mail.service.IMailerRestService] ERROR com.ibm.team.jfs                                    - CRJZS5074E Unexpected exception sending mail
javax.mail.MessagingException: Could not connect to SMTP host: my.old.smtp.server, port: 25;
  nested exception is:
    java.net.ConnectException: Connection refused


I did a trace and decided to change the SMTP server to one which is the closest in the zone. The server was restarted and no error messages appeared for some days. I tested the SMTP sending a mail an everything worked.

However today the same error message appeared, the weirdest thing is that error message indicates a communication problem with the same old SMTP server.

I modified the SMTP server from jts -->server --> Configuration --> E-mail settings

Nothing has changed, the same "new" SMTP server is configured so I don't see a reason for receiving an error message related to "old" SMTP.

I have searched in Advanced settings and I don't find any other field including the old SMTP server.

Could you please indicate if something else has to be modified?

Regards.