The alias section of the System tab determines what SLmail should consider as a local domain. If you have an atypical configuration, such as handling mail for multiple domains, you may need to change the values specified during setup.
The Incoming alias is what SLmail uses to determine if a message is addressed to a user in the Primary domain. This should read as domain.com , where your users' email addresses should be formatted as username@domain.com .
If your SLmail host is handling mail for multiple domains, you can use the Incoming Alias field to set this up. Enter all the domains for which you wish to handle mail, separated by semicolons. In our example, you would enter domain.com;seconddomain.com . This is handy when you are in the middle of changing domain names and wish your users to be able to receive mail as both username@domain.com and username@seconddomain.com.
Note: The most common call made to Seattle Lab's Technical Support department is prompted by mail from the outside world not being received by SLmail. This is because the Incoming alias field has been changed to contain node.domain.com instead of domain.com. Unless you are sure of what you are doing, it is best to leave the alias set to domain.com. If you do change aliases and the mail server no longer receives mail, the first thing to try is to change the aliases back to they were initially configured.
IMPORTANT: Do NOT list Secondary Domains in the incoming alias field. If you do so, your Secondary Domains will not work properly. All Domain names entered into the field will be treated as the Primary Domain when routing mail.
The Outgoing Alias is used when SLmail generates messages of it's own, such as a bounce message. This is how SLmail knows what domain name to use in its address. This field is also used when mail is sent through SLmail without a fully qualified domain name in the From or To fields.
For example, if you have domain.com in your Outgoing Alias field and a user addressed an email message to username, without a domain name added. SLmail will append that username so that it will read username@domain.com in the To field of the message.