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Shirker
Asked: 2014-11-27 00:35:30 +0800 CST

postfix::header_checks custom multi-line text replace in the mail header

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I very successfully dealt with single line headers in pcre:/etc/postfix/header_check. But when it comes to multi-lines, I'm a bit frustrated. Here is a part of header:

X-MS-Has-Attach:
X-MS-TNEF-Correlator:
Content-Type: multipart/alternative;
    boundary="_000_8FA6C259529CB0418FBDF96A6B22A486209F15MAILmynetworkloca_"
MIME-Version: 1.0

--_000_8FA6C259529CB0418FBDF96A6B22A486209F15MAILmynetworkloca_
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

test

--_000_8FA6C259529CB0418FBDF96A6B22A486209F15MAILmynetworkloca_
Content-Type: text/html; charset="us-ascii"
Content-Transfer-Encoding: quoted-printable

And what I need, just to get rid of strings like 

--_000_8FA6C259529CB0418FBDF96A6B22A486209F15MAILmynetworkloca_

Or at least replace last part MAILmynetworkloca_ to something like maildomaincom_ I've tried to put to my /etc/postfix/header_check 

/MAILmynetworkloca_/ REPLACE maildomaincom_

but it didn't work

postfix

2 Answers

  1. Best Answer

    FYI: The line --__INSERTSOMERANDOCHARHERE000MAILmynetwok isn't part of email headers. And maybe you don't wanna to alter/remove it.

    Anyway, here to do it.

    You should use both header_checks and body_checks to replace those line.

    Content of main.cf

    body_checks = pcre:/etc/postfix/mimereplace
header_checks = pcre:/etc/postfix/mimereplace

    Content of /etc/postfix/mimereplace

    /^(.*)MAILmynetworkloca_(.*)/ REPLACE ${1}maildomaincom_${2}
    • 2

  2. I think you'll want to use something like /MAILmynetworkloca_$/m REPLACE maildomaincom_ .

    The dollar sign means at the end of the string, the m should put it in multiline mode (according to the PCRE pages)

    Why you'd want to replace that header I don't know, but it's your mail server :)

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