Relaying Email Error Local users may not be able to send mail outside of your domain. If you have the "Require SMTP Authentication for relaying" box checked within the MailSite Console, then you will need to instruct your remote clients to check the option within their e-mail client that says: "MY SMTP SERVER REQUIRES AUTHENTICATION". Once they check that box, they will then be able to relay mail through your server, otherwise on your MailSite server under the SMTP Security window: "Accept Mail For Relay From these Friendly HOSTS" enter the IP addresses of the servers in the remote office or their local LAN example: 10.10.10.* If after this, an error message is received when relaying mail, then please consult the following KB 10003, as outlined below.