How to redirect mails from specific email to one user

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

Resolution

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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 advertisement@domain.com that are flooding your users, and you want to catch all emails from this email address, and to redirect them to a user (sysadm@domain.com) 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:(.*)advertisement@domain.com/ REDIRECT sysadm@domain.com

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

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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:(.*)user005@badspammerdomain.com/   DISCARD #spam Known spammer address
/^From:(.*)Tarot Reading/   DISCARD #spam rule No Tarot reading
/^From:(.*)someaccount@yahoo.com/ REDIRECT ceo@domainexample.com #spam rule redirect all messages from this address
/^From:(.*)<(.*)@yahoo.com>(.*)/    REDIRECT monitor@domainexample.com
/^To:(.*)<(.*)@yahoo.com>(.*)/  REDIRECT monitor@domainexample.com
/^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