Timothy Murphy wrote: > I'll try following the instructions in that document, > as I have had no luck with the documents on www.postfix.org . I have switched over from sendmail to postfix, and the most difficult part was learning how simple it is to configure postfix. Once you get that, a quick web search will let you know the postfix equivalent of a sendmail setting, such as smarthost. I'd be surprised if anything in that document is not right. If you find anything or you need assistance, the list is here. Use postconf with -d or -n to see default and non- default configurations. "man -a postconf" and is your friend. Also, check /var/log/maillog for errors after making any configuration changes. Some errors may not appear for a day or two until a matching message is received, for example with size restrictions. > The changeover from sendmail to postfix in CentOS-6 > was probably a mistake, in my view, unless required to follow RedHat. > At the very least proper documentation should be a pre-requisite > for a change like this. My two cents. There's a good reason postfix has been chosen to replace sendmail as the default MTA. As with anything new, it takes time to feel comfortable with it. c