Mailinglist Archive: opensuse (2827 mails)

["Amedee Van Gasse" <amedee@xxxxxxxxx>]

On Fri, December 19, 2008 11:13, Amedee Van Gasse wrote:
> On Thu, December 18, 2008 16:55, Per Jessen wrote:
> > Amedee Van Gasse wrote:
> >
> > > Hello,
> > >
> > > I have a question about Postfix header checks and regular expressions.
> > > In my main.cf I have:
> > >
> > > header_checks =         regexp:/etc/postfix/maps/header_checks
> > >
> > > and in header_checks I have:
> > >
> > > /^[To|Cc]:.*,.*,.*,.*,.*,.*,.*,.*,.*,.*$/       REJECT Too many
> > > recipients. Please use BCC.
> > >
> > > I *think* that this means:
> > > * Check for a header that starts with either "To" or "Cc".
> > > * any string, followed by a comma (email address separator)
> > > * check for 9 comma's or 10 strings (addresses)
> > >
> > > In other words, if you send me an email and you over-abuse the To or
> > > CC-field, your mail will be rejected with the message "Too many
> > > recipients. Please use BCC."
> > >
> > > I want to do this because I'm tired of educating always the same
> > > people. I don't want emails (usually chain mail or "funny
> > > powerpoints") where the receipient list is longer than the actual
> > > message. Even if it's from family.
> > >
> > > Unfortunately, it doesn't seem to work. Mail with more than 10 people
> > > in the CC is still getting trough.
> >
> > Try this instead:
> >
> > /^(To|Cc):([^,]+,){9}/i       REJECT Too many
> >
> > [] = character class
> > () = grouping
>
> Thanks all.
> I forgot that a regex is greedy.
> And thank you Per for optimizing.
>
> I'm going to test now.

Thanks all, it worked.
The sender gets a nice message:

Server replied: 550 5.7.1 Too many recipients. Please use BCC.

-- 
Amedee

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