I have a few mailer scripts that I run from the command line. Each script handles newsletters for different domains. It occured to me that the hostname of the machine would be the same for each mail-out and would appear in the header of the message. This then led me to think that returned messages that came back with connection refused may have something to do with the fact that the hostname in the header doesn't match were the message originated and was being rejected by a spam filter.
1) Am I deluded in thinking that setting the hosname will reduce the amount of rejected mail.
2) If not is it possible to do this in a script (without privalages) - as I would like to automate the sending of bulletins