How to Remove X-headers

Glenn glenn at mail.txwes.edu
Fri Mar 13 13:05:34 GMT 2009 

Julian - Thanks very much for adding this functionality.  I tried upgrading 
our Red Hat EL4/Postfix machines, and the new version stopped mail flow 
altogether.  I have gone back to the older version (4.73.4-2) until I can 
figure out what went wrong.   -Glenn.


---------- Original Message -----------
From: Julian Field <MailScanner at ecs.soton.ac.uk>
To: MailScanner discussion <mailscanner at lists.mailscanner.info>
Sent: Thu, 12 Mar 2009 15:39:40 +0000
Subject: Re: How to Remove X-headers

> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
> 
> On the basis that sounds fairly sensible and appears to provide the 
> flexibility people are after, I have written and released it as 4.75.9.
> 
> There is new text near the start of the description of "Remove These 
> Headers" which says this:
> 
> # This is a space-separated list of a mixture of any combination of
> # 1. Names of headers, optionally ending with a ':'
> #    (the ':' will be added if not supplied)
> # 2. Regular expressions starting and ending with a '/'.
> #    These regular expressions are matched against the entire header line,
> #    not just the name of the header.
> #    **NOTE** The regular expressions must *not* contain spaces,
> #             so use '\s' instead of ' '.
> 
> It appears to work fine in sendmail, I would be grateful if people 
> using other mailers could also test it for me.
> 
> Thanks guys,
> Jules.
> 
> On 12/3/09 15:17, Julian Field wrote:
> > * PGP Signed: 03/12/09 at 15:18:00
> >
> > Okay, no problem.
> > The new functionality will still take a list of header names or 
> > regexps. The regexps mustn't contain spaces or I can't parse them, so 
> > use \s when you mean a space.
> > Header names can optionally end in a ':', it will be added if not 
> > supplied.
> > Header names can optionally be of the form /regular-expression/ in 
> > which case this will be applied to the whole header line (including 
> > the name and value of the header of course). The test will be appled 
> > in a case-insensitive manner.
> >
> > Is that what people want?
> >
> > Jules.
> >
> > On 12/3/09 14:58, Glenn wrote:
> >> Julian - Yes, I tried X-Mime.* and it does not work.
> >>
> >> It seems the X-header limit in Microsoft Exchange is just now 
> >> beginning to
> >> cause problems.  There is already a commercial fix for Exchange 2007
> >> (http://www.codeplex.com/HeaderFilterAgent), but of course we are using
> >> Exchange 2003.  So you have at least one "people" who could put this
> >> functionality to use, and probably others will be looking for it soon.
> >> Thanks.   -Glenn.
> >>
> >>
> >> ---------- Original Message -----------
> >> From: Julian Field<MailScanner at ecs.soton.ac.uk>
> >> To: MailScanner discussion<mailscanner at lists.mailscanner.info>
> >> Sent: Thu, 12 Mar 2009 14:40:51 +0000
> >> Subject: Re: How to Remove X-headers
> >>
> >>> -----BEGIN PGP SIGNED MESSAGE-----
> >>> Hash: SHA1
> >>>
> >>> Have just taken a look at the code.
> >>> Have you tried something like this in your ruleset
> >>>
> >>> From: 10.11.12.13 X-Mime.*
> >>>
> >>> as I think that may well indeed work. It won't work in Exim, but may
> >>> well work in the others.
> >>> If people want this functionality put in properly so you could do
> >>> something like
> >>> From: 10.11.12.13 ^X-Mime.*
> >>> to anchor it properly, then I could add this.
> >>>
> >>> Jules.
> >>>
> >>> On 12/3/09 14:22, Julian Field wrote:
> >>>> > Old Signed: 03/12/09 at 14:22:04
> >>>>
> >>>> No, you can't use a regular expression to define which headers you
> >>>> want to remove, just a list of header names. I'm fairly sure the
> >>>> documentation does not imply that you *can* use regexps here.
> >>>>
> >>>> On 12/3/09 14:14, Glenn wrote:
> >>>>> Oh, sorry, I did not read Joost's post carefully enough to see the
> >>>>> difference
> >>>>> between his expression and mine.  However, I just tested his
> >>>>> expression, /^X-
> >>>>> Mime.*\:/ , and it doesn't work either.  I am wondering if
> >>>>> MailScanner can
> >>>>> use Perl expressions in this ruleset?  Thanks again.   -Glenn.
> >>>>>
> >>>>> ---------- Original Message -----------
> >>>>> From: "Glenn"<glenn at mail.txwes.edu>
> >>>>> To: MailScanner discussion<mailscanner at lists.mailscanner.info>
> >>>>> Sent: Thu, 12 Mar 2009 09:02:37 -0500
> >>>>> Subject: Re: How to Remove X-headers
> >>>>>
> >>>>>> Thanks for all the attention, but I'm afraid I still have the same
> >>>>>> problem.  Regardless of the propriety of doing so, I would like to
> >>>>>> be able to filter headers using the "Remove These Headers" ruleset,
> >>>>>>    and I can't get it to work with Perl regular expressions.  
> >>>>>> Joost's
> >>>>>> post seems to confirm that I am using an expression that should
> >>>>>> remove the X-MimeOLE: header, but it doesn't.  Can anyone shed light
> >>>>>> on this?  Thanks.   -Glenn.
> >>>>>>
> >>>>>> ---------- Original Message -----------
> >>>>>> From: Joost Waversveld<joost at waversveld.nl>
> >>>>>> To: MailScanner discussion<mailscanner at lists.mailscanner.info>
> >>>>>> Sent: Thu, 12 Mar 2009 09:38:58 +0100
> >>>>>> Subject: Re: How to Remove X-headers
> >>>>>>
> >>>>>>> /^XMime.*\:/   would match XMime<something>   (and not X-
> >>>>>>> Mime<something>)
> >>>>>>>
> >>>>>>> The regular expression should be /^X-Mime.*\:/
> >>>>>>>
> >>>>>>> Best regards,
> >>>>>>>
> >>>>>>> Joost Waversveld
> >>>>>>>
> >>>>>>> Alex Broens wrote:
> >>>>>>>> On 3/11/2009 10:50 PM, Glenn wrote:
> >>>>>>>>> We use MailScanner and Postfix on a mail gateway server and 
> >>>>>>>>> forward
> >>>>>>>>> mail to an internal Microsoft Exchange 2003 server.  Evidently,
> >>>>>>>>> enough X-headers have accumulated in an Exchange database to 
> >>>>>>>>> cause a
> >>>>>>>>> problem, so we need to remove X-headers before they are 
> >>>>>>>>> forwarded to
> >>>>>>>>> the Exchange server.
> >>>>>>>>>
> >>>>>>>>> There is a line in MailScanner.conf that allows us to name 
> >>>>>>>>> whatever
> >>>>>>>>> headers we want to remove ("Remove These Headers"), but this 
> >>>>>>>>> raises
> >>>>>>>>> some questions.  If we just blanket remove all X-headers, 
> >>>>>>>>> won't this
> >>>>>>>>> defeat features of MailScanner that depend on MailScanner adding
> >>>>>>>>> headers?
> >>>>>>>>>
> >>>>>>>>> According to hints in the MailScanner rules directory, we 
> >>>>>>>>> should be
> >>>>>>>>> able to use regular Perl expresssions to create a ruleset to 
> >>>>>>>>> exclude
> >>>>>>>>> certain headers from the delete list.  My problem is that I don't
> >>>>>>>>> have a clue how to write regular Perl expressions.  From what 
> >>>>>>>>> I've
> >>>>>>>>> read online, for example, the lines below should be 
> >>>>>>>>> equivalent, but
> >>>>>>>>> when I use the Perl expression in the ruleset it doesn't work.
> >>>>>>>>>
> >>>>>>>>> From:  [ipaddress]  X-MimeOLE:    ##this removes the X-MimeOLE
> >>>>>>>>> header
> >>>>>>>>>
> >>>>>>>>> From:  [ipaddress]  /^XMime.*\:/  ##this doesn't
> >>>>>>>>>
> >>>>>>>>> I know this isn't a Perl forum, but I'm hoping that someone 
> >>>>>>>>> who has
> >>>>>>>>> tried this can enlighten me.  If I could just get a simple
> >>>>>>>>> expression
> >>>>>>>>> to work, I might be able to build what I need.  Thanks.   -Glenn.
> >>>>>>>> Before you start breaking MIME headers, who told you this or 
> >>>>>>>> what MS
> >>>>>>>> KB article covers this?
> >>>>>>>>
> >>>>>>> -- 
> >>>>>>> Joost Waversveld
> >>>>>>>
> >>>>>>> -- 
> >>>>>>> MailScanner mailing list
> >>>>>>> mailscanner at lists.mailscanner.info
> >>>>>>> http://lists.mailscanner.info/mailman/listinfo/mailscanner
> >>>>>>>
> >>>>>>> Before posting, read http://wiki.mailscanner.info/posting
> >>>>>>>
> >>>>>>> Support MailScanner development - buy the book off the website!
> >>>>>> ------- End of Original Message -------
> >>>>>>
> >>>>>> -- 
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> >>>>>> http://lists.mailscanner.info/mailman/listinfo/mailscanner
> >>>>>>
> >>>>>> Before posting, read http://wiki.mailscanner.info/posting
> >>>>>>
> >>>>>> Support MailScanner development - buy the book off the website!
> >>>>> ------- End of Original Message -------
> >>>>>
> >>>> Jules
> >>>>
> >>> Jules
> >>>
> >>> - -- Julian Field MEng CITP CEng
> >>> www.MailScanner.info
> >>> Buy the MailScanner book at www.MailScanner.info/store
> >>>
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> >>> Contact me!
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> >>> =Iqy2
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> >>> Before posting, read http://wiki.mailscanner.info/posting
> >>>
> >>> Support MailScanner development - buy the book off the website!
> >> ------- End of Original Message -------
> >>
> >
> > Jules
> >
> 
> Jules
> 
> - -- 
> Julian Field MEng CITP CEng
> www.MailScanner.info
> Buy the MailScanner book at www.MailScanner.info/store
> 
> Need help customising MailScanner?
> Contact me!
> Need help fixing or optimising your systems?
> Contact me!
> Need help getting you started solving new requirements from your 
> boss? Contact me!
> 
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