Email redirection

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This document gather possibilities of email redirection using postfix and zimbra. Please note these modifications may not survive zimbra upgrades.


Contents


Redirection based on sender address

In this example, emails send from user@domain.com will be trapped and sent to user_trapped@domain2.com. We are using check_sender_access to achieve this.

1. Enter following in the file “/opt/zimbra/conf/postfix_recipient_restrictions.cf”. Make sure it is entered at the top of the file.

 vi /opt/zimbra/conf/postfix_recipient_restrictions.cf
 check_sender_access hash:/opt/zimbra/postfix/conf/restricted_senders 

2. Create a file "/opt/zimbra/postfix/conf/restricted_senders" and list all the users, whose emails you want to redirect.

 cat /opt/zimbra/postfix/conf/restricted_senders
 user@domain.com REDIRECT user_trapped@domain2.com
 user2@domain.com REDIRECT user2_trapped@zbc.com
 ...

3. Create the hash and restart postfix.

 postmap /opt/zimbra/postfix/conf/restricted_senders
 zmmtactl stop 
 zmmtactl start

Test

Login as user@domain.com and try sending email to any address. It will be redirected to user_trapped@domain2.com account and the log entry should look like this in /var/log/zimbra.log

 Apr 12 10:08:34 mta postfix/smtpd[521]: NOQUEUE: redirect: RCPT from domain.com[xx.xx.xx.xx]: <user@domain.com>: Sender address triggers REDIRECT 
 user_trapped@domain2.com; from=<user@domain.com> to=<realrecipient@domain.com> proto=ESMTP

Sender BCC Maps

In this example, we need a copy of all emails sent FROM user@domain.com to bccuser@domain.com user. I am using sender_bcc_maps.

1. Enter following line at the end of file /opt/zimbra/postfix/main.cf file.

 sender_bcc_maps = hash:/opt/zimbra/postfix/conf/sender_bcc

2. Create a file /opt/zimbra/postfix/sender_bcc and add the sender address and forward address in following format. You can enter a list of users.

 cat /opt/zimbra/postfix/sender_bcc
 user@domain.com  bccuser@domain.com

3. Create the hash and reload postfix.

 postmap /opt/zimbra/postfix/sender_bcc
 postfix reload

Test

Send an email from user@domain.com and check the logs in zimbra.log. You should see two send entries, one for user@domain.com and other for bccuser@domain.com

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