Carl T. Miller 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. Why should it be difficult to learn that, unless the documentation is misleading? (It is.) > I'd be surprised if anything in that document is not > right. If you find anything or you need assistance, > the list is here. I didn't find anything wrong in the document in question (http://wiki.centos.org/HowTos/postfix), except that a couple of packages mentioned (ystem-change-mail*) don't seem to exist in CentOS-6. However, if my experience is anything to go by, it missed out two essential points. Firstly, after following the instructions meticulously, I found that I could not send out mail because (according to /var/log/maillog) the From address was tim at localhost.localdomain , and this was rejected by the recipient host or rather his ISP. ------------------------------- <tim at localhost.localdomain> MAIL FROM domain does not exist (in reply to MAIL FROM command) ------------------------------- I cured this by adding tim tim at gayleard.eu to /etc/hosts . I don't know if this is the best way to go about it? After correcting this, I found my email was still rejected, with the message "Blacklisted by Spamhaus"! I read in <http://www.spamhaus.org/pbl/query/PBL814205> that 'the reason is simply that you need to turn on "SMTP Authentication"' Googling for "centos postfix authentication" took me on a long and not very interesting journey. I was amazed how many apparently widely differing solutions were suggested. In the end I found the simplest solution in <http://www.cyberciti.biz/faq/postfix-smtp-authentication-for-mail-servers/> which describes the postfix equivalent of sendmail's SMART_HOST. (A lot more complicated than the one line in sendmail.mc .) -- Timothy Murphy e-mail: gayleard /at/ eircom.net School of Mathematics, Trinity College, Dublin 2, Ireland