A user installed Dataverse and wanted to use a third party email service that supports SMTP but requires log in credentials. We currently do not support this, this ticket is a request to implement it.
See RT 234442 for more information. The third party service is mailgun.org.
Update: This may be natively supported through additional properties in the Java mail client config. We'll confirm and close if that is the case.
It looks like this can be configured though admin console/ domain.xml:
http://www.hildeberto.com/2010/02/sending-e-mails-with-javamail-on-glassfish-v3.html