On Wed, Aug 13, 2014 at 12:32 PM, Timothy Murphy <gayleard at alice.it> wrote: > You sound as though you think it is meritorious > for software to be difficult to use. > No, I believe education is meritorious. > The task of postfix seems to me fairly easy to understand, > so I don't see why implementing a solution should be that difficult. > It seems easy to understand because you do not understand it. The more you delve into the topic of mail, the more you realize it is not easy to understand with just a few passing glances. Perhaps that is why you are not finding a simple document to answer your question. Either way, I had no intention of making you mad. I was simply trying to help by saying that reading a book on postfix is a very worthwhile pursuit. You rejected it, and that is fine. The only other suggestion I could make is to also read the postfix mailing list (http://www.postfix.org/lists.html) or the spamassassin mailing list ( https://wiki.apache.org/spamassassin/MailingLists). Do with it what you will.