How to Remove X-headers
Glenn
glenn at mail.txwes.edu
Tue Apr 7 20:21:13 IST 2009
I finally got back to this a few days ago. Took the opportunity to build a
new mail gateway using Red Hat EL5, Sendmail, milter-greylist, ClamAV and
MailScanner 4.75.9-2. Everything works great, so I'm about ready to try
removing some X-headers. Only one question -- would removing all X-headers
mess up MailScanner? After all, MailScanner does put some X-headers in,
right? We do have a downstream server running MailScanner (unnecessarily
now), but I'm mainly concerned with the gateway server itself.
I suppose Exchange 2003 might rely on some X-headers coming through. If
anyone can think of some, do tell. Thanks. -Glenn.
---------- Original Message -----------
From: Julian Field <MailScanner at ecs.soton.ac.uk>
To: MailScanner discussion <mailscanner at lists.mailscanner.info>
Sent: Sun, 15 Mar 2009 13:36:13 +0000
Subject: Re: How to Remove X-headers
> I have found and fixed that bug. Missed out a $pos++ in a loop exit
> condition.
> Please try 4.75.9-2.
>
> Cheers,
> Jules.
>
> On 13/3/09 13:05, Glenn wrote:
> > 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 -------
> >>>>>>>>
> >>>>>>>> --
> >>>>>>>> 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 -------
> >>>>>>>
> >>>>>>>
> >>>>>> 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!
> >>>>>
> >>>>> PGP footprint: EE81 D763 3DB0 0BFD E1DC 7222 11F6 5947 1415 B654
> >>>>>
> >>>>> -----BEGIN PGP SIGNATURE-----
> >>>>> Version: PGP Desktop 9.9.1 (Build 287)
> >>>>> Comment: Use Enigmail to decrypt or check this message is legitimate
> >>>>> Charset: ISO-8859-1
> >>>>>
> >>>>> wj8DBQFJuR71EfZZRxQVtlQRAjxQAKCWXxHnjDlgWXLyJM+w/5Xa8ljlZwCgiUZt
> >>>>> pgTRow7Fqx83C5gTW0Kilco=
> >>>>> =Iqy2
> >>>>> -----END PGP SIGNATURE-----
> >>>>>
> >>>>> --
> >>>>> This message has been scanned for viruses and
> >>>>> dangerous content by MailScanner, and is
> >>>>> believed to be clean.
> >>>>>
> >>>>> --
> >>>>> 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 -------
> >>>>
> >>>>
> >>> 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!
> >>
> >> PGP footprint: EE81 D763 3DB0 0BFD E1DC 7222 11F6 5947 1415 B654
> >>
> >> -----BEGIN PGP SIGNATURE-----
> >> Version: PGP Desktop 9.9.1 (Build 287)
> >> Comment: Use Enigmail to decrypt or check this message is legitimate
> >> Charset: ISO-8859-1
> >>
> >> wj8DBQFJuSy8EfZZRxQVtlQRArdmAKC05+diwhk2XuJoQ31gJASOjlX57QCcDcum
> >> B2jdj/D1uqVV8JA87+T0kHM=
> >> =p4ZI
> >> -----END PGP SIGNATURE-----
> >>
> >> --
> >> This message has been scanned for viruses and
> >> dangerous content by MailScanner, and is
> >> believed to be clean.
> >>
> >> --
> >> 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 -------
> >
> >
>
> Jules
>
> --
> Julian Field MEng CITP CEng
> www.MailScanner.info
> Buy the MailScanner book at www.MailScanner.info/store
>
> MailScanner customisation, or any advanced system administration
> help? Contact me at Jules at Jules.FM
>
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> PGP public key: http://www.jules.fm/julesfm.asc
>
> --
> This message has been scanned for viruses and
> dangerous content by MailScanner, and is
> believed to be clean.
>
> --
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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 -------
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