So i have everything set up in SLS running perfectly: ichat, address book, ical, web pages, time machine, file sharing.....everything except email. I've signed up for lynda.com and tried to copy their email set up and it just won't work out for me. I know that DNS is running locally and working because the network utility maps everything out and it works but here are my settings. Godaddy. A host is set to my external ip address CNAME mail.domain.com pointing to server.domainname.com MX record mail.domainname.com Server: machine record for server.domainname.com at ip address 18.104.22.168 alias mail.domainname.com pointing to server.domainname.com mx record mail.domainname.com email server setting: host name: server.domainname.com smtp enabled allowing incoming mail so the problem is that when I set up a clients to look for either mail.domainname.com or server.domainname.com I get the error message that the "smtp server is not responding" I can't seem to get it to respond no matter what i do. Please help??