Difference between revisions of "How to disable various headers"

(Resolution)
(Resolution)
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==Resolution==
 
==Resolution==
  
To start with, we will first create a custom header check file, that will contain our new headers:
+
 
 +
1. To start with, we will first create a custom header check file, that will contain our new headers:
  
 
  $ touch /opt/zimbra/conf/custom_header_checks
 
  $ touch /opt/zimbra/conf/custom_header_checks
  
Once we create the file, we are going to add it to the zimbra configuration:
+
2. Once we create the file, we are going to add it to the zimbra configuration:
  
 
  $ zmprov mcf zimbraMtaHeaderChecks 'pcre:/opt/zimbra/conf/postfix_header_checks  pcre:/opt/zimbra/conf/custom_header_checks'
 
  $ zmprov mcf zimbraMtaHeaderChecks 'pcre:/opt/zimbra/conf/postfix_header_checks  pcre:/opt/zimbra/conf/custom_header_checks'
  
The next step would be to populate the file with data. Below is an example of this file, with various headers that we would like to be ignored:
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3. The next step would be to populate the file with data. Below is an example of this file, with various headers that we would like to be ignored:
 
 
  
 
  /X-Virus-Scanned/    IGNORE
 
  /X-Virus-Scanned/    IGNORE
Line 39: Line 39:
 
The above headers are just an example. You can use any of these headers to hide sensitive information based on your needs. But beware that some MX servers will automatically mark such emails passing through as spam. Furthermore, removing all the above information will make troubleshooting very difficult. Choose which headers you would like to remove, and perform tests before implementing that on a production system.  
 
The above headers are just an example. You can use any of these headers to hide sensitive information based on your needs. But beware that some MX servers will automatically mark such emails passing through as spam. Furthermore, removing all the above information will make troubleshooting very difficult. Choose which headers you would like to remove, and perform tests before implementing that on a production system.  
  
 
+
4. Once we finish editing that file, we run the following commands to complete the setup:
Once we finish editing that file, we run the following commands to complete the setup:
 
  
 
  $ zmprov mcf zimbraMtaBlockedExtensionWarnRecipient FALSE
 
  $ zmprov mcf zimbraMtaBlockedExtensionWarnRecipient FALSE
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Confirm by running:
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5. Confirm that the new header check file is picked up by zimbra:
 
  $ postconf | grep header_checks
 
  $ postconf | grep header_checks
  

Revision as of 14:01, 10 July 2019

How to disable various headers

   KB 23867        Last updated on 2019-07-10  




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Problem

The aim of this wiki is to show how to remove sensitive email headers that are normally generated when sending an email.


Resolution

1. To start with, we will first create a custom header check file, that will contain our new headers:

$ touch /opt/zimbra/conf/custom_header_checks

2. Once we create the file, we are going to add it to the zimbra configuration:

$ zmprov mcf zimbraMtaHeaderChecks 'pcre:/opt/zimbra/conf/postfix_header_checks  pcre:/opt/zimbra/conf/custom_header_checks'

3. The next step would be to populate the file with data. Below is an example of this file, with various headers that we would like to be ignored:

/X-Virus-Scanned/     IGNORE
/^Received: from 127.0.0.1/     IGNORE
/^X-Originating-IP:/     IGNORE
/^X-Mailer:/     IGNORE
/^Mime-Version:/     IGNORE
/^User-Agent:/     IGNORE
/^X-Sanitizer:/     IGNORE
/^X-Spam-Status:/     IGNORE
/^X-Spam-Level:/     IGNORE
/^Message-ID:/     IGNORE
/^X-MimeOLE:/     IGNORE
/^X-MSMail-Priority:/     IGNORE
/^Received:/     IGNORE


The above headers are just an example. You can use any of these headers to hide sensitive information based on your needs. But beware that some MX servers will automatically mark such emails passing through as spam. Furthermore, removing all the above information will make troubleshooting very difficult. Choose which headers you would like to remove, and perform tests before implementing that on a production system.

4. Once we finish editing that file, we run the following commands to complete the setup:

$ zmprov mcf zimbraMtaBlockedExtensionWarnRecipient FALSE
$ zmmtactl restart


5. Confirm that the new header check file is picked up by zimbra:

$ postconf | grep header_checks




Verified Against: Zimbra Collaboration 8.7, 8.8.9, 8.8.12 Date Created: 12/02/2018
Article ID: https://wiki.zimbra.com/index.php?title=How_to_disable_various_headers Date Modified: 2019-07-10



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Wiki/KB reviewed by SME1 SME2 COPY EDITOR Last edit by Teodor Vizirov
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