Archiva SMTP Real domain name required for sender address Error - archiva

Question

I installed the stand alone Apache Archiva 1.3 Maven repository and I am having trouble configuring the SMTP settings for the e-mail validation. I configured the SMTP address by changing the mail.smtp.host property in jetty.xml. I was not able to find any documentation on Archiva's site for configuring this.
<New id="validation_mail" class="org.mortbay.jetty.plus.naming.Resource">
<Arg>mail/Session</Arg>
<Arg>
<New class="org.mortbay.naming.factories.MailSessionReference">
<Set name="user"></Set>
<Set name="password"></Set>
<Set name="properties">
<New class="java.util.Properties">
<Put name="mail.smtp.host">mail.xyz.com</Put>
</New>
</Set>
</New>
</Arg>
</New>
Here is the error that I am getting when I try to register a user
Failed messages: com.sun.mail.smtp.SMTPSendFailedException: 553 5.5.4 <testuser#localhost>... Real domain name required for sender address
caused by
org.springframework.mail.MailSendException; nested exception details (1) are:
Failed message 1:
com.sun.mail.smtp.SMTPSendFailedException: 553 5.5.4 <testuser#localhost>... Real domain name required for sender address

Answer 1

I added the security.properties file to the conf directory as mentioned here. I then added the properties listed below to the file. The email.from.address property is the answer. These properties can be found in the Redback config-defaults.properties.
email.validation.required=true
email.from.name=Archiva Admin
email.from.address=archivaadmin#xyz.com
email.validation.subject=Archiva Maven Repository