Thanks for your answer Mr Venema. In the readme they define the service on the port 10025 directly in the master.cf using the spawn utility, maybe the smtp agent doesn't lookup a dns record if it finds the next host defined in the service column of master.cf. Unfortunately now I'm in the office and I have to wait to have further fun with postfix but the smtp_host_lookup will surely solve the problem.
Regards Luca On 20 October 2017 at 15:43, Wietse Venema <wie...@porcupine.org> wrote: > fusillator: > > Does FILTER_README suppose you have a dns record for localhost? > > Is there a way to use /etc/hosts to resolve localhost? > > FILTER_README does none of that. It just describes how you use a > Postfix SMTP client (or other Postfix delivery agent) to send mail > into a filter, and how to get that mail back into Postfix. > > In other words, if your SMTP client can't deliver to localhost, > then that has nothing to do with content filtering. > > By default (smtp_host_lookup = dns) the SMTP client uses DNS to > look up destinations. You can change that; see > http://www.postfix.org/postconf.5.html#smtp_host_lookup > > Wietse >
