Actions involving the automatic sending of an email fail

An event rule is created, including as the required action the sending of an email. When the event occurs, the action fails with the following message: 
AWSMSP104E  The mail "<mailID>" has not been successfully  
 delivered to "<recipient>".
Reason: "Sending failed;
nested exception is:
?????class javax.mail.MessagingException: 553 5.5.4 <TWS>... 
Domain name required for sender address TWS

Cause and solution:

The mail send action failed because the domain name of the SMTP server was not defined in the mail sender name global option: mailSenderName (ms).

Use the optman command to specify the correct mail sender name including the domain. For example, if the mail sender name is tws@alpha.ibm.com, issue the following command:

optman chg ms=tws@alpha.ibm.com