Hi, On Tue, Aug 19, 2008 at 14:44, Marcelo Roccasalva <marcelo-centos at irrigacion.gov.ar> wrote: > Fetchmail fetchs mails and resends them through you local MTA (so it > always uses 127.0.0.1). To filter by the sender IP, your MTA has to be > the [unique] MX of your domain... Postfix actually has a feature (XCLIENT) to receive this information to the software connecting to it: http://www.postfix.org/XCLIENT_README.html However, AFAIK, fetchmail does not have support for it, and I'm not aware of any patch that uses it. Filipe