package WebGUI::Mail::Send uses Net::SMTP or the sendmail command to actually send the mail (from 7.5.8 beta)  see: /data/WebGUI/lib/WebGUI/Mail/Send.pm.

If you are using the sendmail command (or script), then obviously authentication is not needed.

In case you are using Net::SMTP then auth could be used:

auth ( USERNAME, PASSWORD )
Attempt SASL authentication. 

So the these things would have to be done to implement this:

1. Edit the Settings form to have fields to add smtpAuthUser and smtpAuthPassword to the settings table.
2. Edit WebGUI::Mail::Send to insert this (starting at line 463) of /data/WebGUI/lib/WebGUI/Mail/Send.pm :  

 
if ($self->session->setting->get("smtpAuthUser")) {
$smtp->auth( $self->session->setting->get("smtpAuthUser"), $self->session->setting->get("smtpAuthPassword") ) or $self->session->errorHandler->error("Couldn't authenticate user:$self->session->setting->get("smtpAuthUser")  to mail server: ".$self->session->setting->get("smtpServer") );
 
} 

Koen de Jonge - ProcoliX
http://www.procolix.com
Hosting - WebGUI - Virtualization