Häufig gestellte Frage

MimeDefang is a program that add extra X-anti-abuse headers to your email

it also cause your emails to be scanned with spamassasin and a few more tricks that it apply

To start just follow the following steps

yum install mimedefang

in /etc/sysconfig/mimedefang uncomment and edit the SOCKET line to:

SOCKET=inet:10997

Make the port whatever you want, 10997 is my random choice.

Now:

service mimedefang start chkconfig mimedefang on

And now you can simply add the milter config to /etc/postfix/main.cf

smtpd_milters = inet:10997

so now your config looks like this

smtpd_milters = inet:10997 inet:127.0.0.1:8891 non_smtpd_milters = inet:127.0.0.1:8891 milter_default_action = accept compatibility_level = 2

and in /etc/mail/mimedefang-filter.cf you can edit and apply following settings

at the filter-begin search for

if ($action eq "tempfail") { action_tempfail("Problem running virus-scanner"); md_syslog('warning', "Problem running virus scanner: code=$code, category=$category, action=$action"); }

then under it apply the following

#custom filter action_add_header("X-AntiAbuse-virusscanner", "$category"); action_add_header("X-AntiAbuse-Helo", "$Helo"); action_add_header("X-AntiAbuse-Relayhostname", "$RelayHostname"); action_add_header("X-AntiAbuse-Relayaddr", "$RelayAddr"); action_add_header("X-AntiAbuse-Sender", "$Sender ");

if those are done then you can execute the following commands to restart the services and time to do a test email

service mimedefang restart service postfix restart

after restart you can test out to see if the email works

send a email to a forwarded adress that forwards to gmail and you can see if your headers get a pass or fail

if done correctly then it should pass Dkim/Dmarc and SPF records and you should see the following into your email

dkim=pass header.i=@protonmail.com header.s=protonmail3 header.b=TxDa06R7; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=protonmail.com X-AntiAbuse-virusscanner: ok X-AntiAbuse-Helo: mail-41104.protonmail.ch X-AntiAbuse-Relayhostname: mail-41104.protonmail.ch X-AntiAbuse-Relayaddr: 185.70.41.104 X-AntiAbuse-Sender: X-AntiAbuse-Score: -0.007 () FREEMAIL_FROM,HTML_MESSAGE,SPOOFED_FREEMAIL,T_SCC_BODY_TEXT_LINE

Be sure to also check out our SRS guide to pass SPF records with forwarders