Resolution:
Description:
============
Send mail activity fails throwing the following exception:

<ns0:SendFailedException xmlns:ns0 = "http://schemas.tibco.com/bw/plugins/mail/5.0/mailExceptions">
        <msg>Error sending mail message. Cause: javax.mail.MessagingException: Could not connect to SMTP host:<host name>, port: 25;
  nested exception is:
    java.net.ConnectException: Connection refused: connect


Environment:
=========
All

Symptoms:
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User can access the host and port directly from the same machine. But when trying to connect to a mail server through BW, it fails to connect. The following exception is thrown:

<ns0:SendFailedException xmlns:ns0 = "http://schemas.tibco.com/bw/plugins/mail/5.0/mailExceptions">
        <msg>Error sending mail message. Cause: javax.mail.MessagingException: Could not connect to SMTP host:<host name>, port: 25;
  nested exception is:
    java.net.ConnectException: Connection refused: connect


Cause:
=====
This can happen because of a firewall or antivirus program running on the machine. Antivirus blocks the port on which BW is trying to open a connection resulting in the exception, "java.net.ConnectException: Connection refused: connect".

Resolution:
=======
Disable the firewall and antivirus software and try to connect to the mail server using BW.