How to redirect mails from specific email to one user

How to redirect emails from specific e-mail address to a specific user

   KB 23139        Last updated on 2023-11-22  

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In this article we will see how to redirect an email from a specific email address to a designated user. For example you have emails coming from that are flooding your users, and you want to catch all emails from this email address, and to redirect them to a user ( that will act as a quarantine user.

To accomplish our task, we will be using Postfix Header check, to catch and redirect the emails.

1. Go to:

cd /opt/zimbra/conf 

2. Create a file for headers:

touch /opt/zimbra/conf/custom_header_checks 

3. In this file add this line:

/^From:(.*) REDIRECT

4. Check the current settings:

zmprov gcf zimbraMtaHeaderChecks

5. If there are no entries you can run the following command to add the new file to the config:

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

If there is already a setting, you can just add the new to the old as follows:

zmprov mcf zimbraMtaHeaderChecks 'pcre:/opt/zimbra/conf/custom_header_checks_old, pcre:/opt/zimbra/conf/custom_header_checks' 

6. Check if the setting is written to the config:

zmprov gcf zimbraMtaHeaderChecks
postconf | grep header_checks 

If not, run:

zmprov mcf zimbraMtaBlockedExtensionWarnRecipient FALSE 

7. Restart mta

zmmtactl restart 

Next, test if the configuration is working by sending an email from a test email.

Additional Content

If you configure that on ZCS 8.6, and then upgrade to 8.7, the setting will be working without re-doing it.

Below are more header checks you may want to use:

/^Subject:(.*)From U.S. Ambassador to Nigeria/   DISCARD #spam rule no msgs from Nigeria
/^Subject:(.*)\?KOI8-R\?/ DISCARD #spam rule Russian encoding not allowed by this server
/^Subject:.*Bad Word*/ REPLACE Subject: Censored
/^From:(.*)Slice-O-Matic Reviews/   DISCARD #spam rule No slice o-matics
/^From:(.*)Your Free iPad/   DISCARD #spam rule No thank you
/^From:(.*)   DISCARD #spam Known spammer address
/^From:(.*)Tarot Reading/   DISCARD #spam rule No Tarot reading
/^From:(.*) REDIRECT #spam rule redirect all messages from this address
/^From:(.*)<(.*)>(.*)/    REDIRECT
/^To:(.*)<(.*)>(.*)/  REDIRECT
/^Received: from .+\..+\.mydomain\.com .+(by mail\.mydomain\.com .+) / REPLACE Received: $1
/^Received: from mac7\.local/ IGNORE
/^Received: from .*\.local/  IGNORE

The source of this information, was taken from here

Verified Against: Zimbra Collaboration 8.7, 8.6 Date Created: 24/03/2017
Article ID: Date Modified: 2023-11-22

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Wiki/KB reviewed by SME1 SME2 COPY EDITOR Last edit by Nbhagwat
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