On Wed, Nov 17, 2021 at 11:57:28AM +1100, raf wrote: > On Tue, Nov 16, 2021 at 05:55:03PM -0500, Ruben Safir <ru...@mrbrklyn.com> > wrote: > > > I got an email from cpa...@mrbrklyn.com which is not from > > us, as we are mrbrklyn.com > > > > How do I block email with this on the From line > > > > >From cpa...@mrbrklyn.com Tue Nov 16 03:59:34 2021 > > I think the simplest approach to reject mail that > falsely claims to be from you is to use the > smtpd_sender_restrictions parameter and > check_sender_access. e.g.: > > In /etc/postfix/main.cf: > smtpd_sender_restrictions = > permit_mynetworks > permit_sasl_authenticated > check_sender_access pcre:/etc/postfix/sender-access > permit >
I want it to accept email from my local machines and my own servers For one thing, I run mailing lists > In /etc/postfix/sender-access: > /mrbrklyn\.com/ REJECT > > Test it with: > > postmap -q cpa...@mrbrklyn.com pcre:/etc/postfix/sender-access > > And then test that you can still send yourself an email! :-) > > This only applies the check for email that isn't coming > from your own networks/users. > > If you don't have/want PCRE installed, you can replace > "pcre:" with "regexp:" (but it's slower). > > Alternatively, you can set up SPF/DKIM/DMARC or rspamd. > There's more work involved, but it might help others if > anyone else is receiving mail that claims to be from you. > But it might just be your domain receiving those emails. > > cheers, > raf -- So many immigrant groups have swept through our town that Brooklyn, like Atlantis, reaches mythological proportions in the mind of the world - RI Safir 1998 http://www.mrbrklyn.com DRM is THEFT - We are the STAKEHOLDERS - RI Safir 2002 http://www.nylxs.com - Leadership Development in Free Software http://www2.mrbrklyn.com/resources - Unpublished Archive http://www.coinhangout.com - coins! http://www.brooklyn-living.com Being so tracked is for FARM ANIMALS and extermination camps, but incompatible with living as a free human being. -RI Safir 2013
