I am adding email service to our ISPConfig (v2.2.27, I think, running on Ubuntu 8.04.1 LTS.) I studied the thread 'ISPConfig & Nameserver' and my users can receive emails correctly. Because I am on a dynamic ip address, I followed Falko's 'Set Up Postfix For Relaying Emails Through Another Mailserver.' Our ISP provider allows ten no charge email address per account and I have setup an email account called 'mailrelay@blah-blah(dot)net' for use as the relay account. While setting up the account, their support instruction specifically allows 250 email relays. I am assuming that this should be plenty as there are only seven users total on our email server. Sorry for length of background info. During testing, I discovered that I had mis-typed one command line instruction. I returned to that command and simply re-entered the correct instructions. I believe I am correct when I say that the second string of commands simply overwrite the old info and that I do not have to delete (for example) the '/etc/postfix/sasl_passwd' file prior to entering new commands? Or does this second string of commands append to existing files? We are having trouble sending emails from the ISPConfig server to the world. Sending email between users works fine. I have confirmed that the relay email account I setup can send emails. Searching the forums has left me confused. I am still learning nameserver and there settings, so it could be that I have misinterpreted the 'ISPConfig & Nameserver' thread. Part way through the thread, the ISP and DNS reference names changed from the beginning of the thread and I think I got confused as to which was the domain registrar and which was the dynamic dns service address. But, if I can receive emails, I think I have that all set correctly? Please help me correct my sending email problem.