I have a mail server up and running using Postfix. <P>I know that open realys are very bad news, however I have NO idea where my users will be logging into this from. They will not all be in a close ...

Ah, the joys of being all things to all people...<P>The non-profit I work for runs Exchange Server 5.0 as their mail system. Everything works reasonably well. Recently, folks started complaining that ...

Open mail relays—e-mail servers that allow third-party transmission of messages—are a significant contributing factor to the volume of unsolicited e-mail currently flying around the Internet. Spammers ...