> -----Original Message----- > From: owner-postfix-us...@postfix.org [mailto:owner-postfix- > us...@postfix.org] On Behalf Of Brian Evans - Postfix List > Sent: Wednesday, July 29, 2009 11:46 PM > To: Postfix users > Subject: Re: Stop spammers sending us spam from users in our domain... > > Clunk Werclick wrote: > > My apologies for the terse caveat. As I understand it, there are some > > external mail services that roaming users may use that forward mail > into > > your Postfix claiming to be from your domain. Myself I do not use > this. > > Relations in England talk of this with Blackberry and O2 when using > > IPhone but these are far too modern for me to understand. > > > > Please hope an expert comes along and soon with a fuller answer, but > I > > think you will be mostly safe with that. If there should be a problem > > your sender will no right away in most cases. > > > > This should only be a real issue with poorly configured clients or > poorly written web scripts. > Those that use the envelope sender as something besides what is in the > From header will work properly. > > SASL clients will also bypass the check so "forwarding" from such > clients will be a non-issue.
And as my_networks also covers all our servers which may email, then we should be ok.. Its in and running and rejecting some already :) Thanks to all
