When building an email server we must always make sure we are not OPEN RELAYS. If you build a server that is an open relay you will soon discover that users not of you own are using your server to send an army of spam. You will also learn that your server is blacklisted, and depending on the damage and how long it has been compromised may need a new IP and Hostname, due to the original being on so many blacklists its not worth trying to get off all of them. [ad#Adsense-4] IPSWITCH has made an alternative to Microsoft popular Exchange server called Imail. The current version of Imail is version 11. To secure the IMAIL server you must first get into the SMTP server settings. 1. From the Imail console Click Services --> Select Imail SMTP [+]