To send email to other users within your LAN use the WinRoute user name of the recipient rather than its full Internet email address.
Example: The user name of the recipient is John and his full email address is john@company.com. You may enter only john into To: field of the email message.
Aliases issue
If you use the full email address of a local user the message will go through the Internet, i.e. to the relay SMTP server of WinRoute and then back to WinRoute. To avoid this you have to specify aliases.
Remember! You must set the WinRoute PC as your outgoing mail server (SMTP).