Stefan Claas:
> Wietse Venema wrote:
>
> > Stefan Claas:
> > > Hi,
> > >
> > > my postfix mail server works perfectly so far.
> > >
> > > However, I am now facing the following problem and have tried as best as I
> > > can to find a solution to this.
> > >
> > > I run an anonymous remailer, which also allows sending emails to mail2news
> > > gateways for Usenet postings. So far so good.
> > >
> > > I would like to achieve the following:
> > >
> > > postfix should modify outgoing email headers that *only* go to mail2news
> > > gateways, using the email gateway addresses for parsing, so that the right
> > > part of the message ID, after the @ charachter, will be modified with a
> > > defined string.
> >
> > Do it in the mail2news gateway.
>
> Oh ... I would have expected a different answer from you.
>
> Like I previously replied in this thread, users are using often multiple
> mail2news gateways when posting messages to Usenet and this would then
> result in different message-ids for the same posting.
Who said that users can only use your Postfix system to post
to news gateways?
Anyway, if you can identify all the the mail2news gateways AND your users
must use your server set up a transport map:
/etc/postfix/main.cf
transport_maps = hash:/etc/postfix/transport
/etc/postfix/transport:
mail2n...@axample.com newsgateway:
mail2news@other.example newsgateway:
(or use a pcre: map if you want broader coverage).
/etc/postfix/master.cf:
newsgateway unix - - n - - smtp
-o header_checks=pcre:/etc/postfix/news-header-checks.pcre
Then populate news-header-checks.pcre with all the patterns that
you need to modify or discard information. It will of course break
DKIM signatures so be aware of that in your DMARC policies.
Wietse
