CentOS 8.x Zimbra forward a copy of all incoming and outgoing emails to audit email ID

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For auditing or security compliance purposes, it might be required to forward a copy of all incoming / outgoing emails to a particular audit email ID. To configure such forwarding use below steps:

1. Create '/opt/zimbra/conf/sender_bcc' with domains and email ID list where a copy of all outgoing mails of domain will be forwarded to given email ID:

   @example.com   audit@example.com
   @rnd.com	audit@example.com

2. Similarly create '/opt/zimbra/conf/recipient_bcc' with domains and email ID list where a copy of all incoming emails of domain will be forwarded to given email ID:

   @example.com   audit@example.com
   @rnd.com	audit@example.com

3. Build the maps

   su - zimbra
   postmap /opt/zimbra/conf/sender_bcc
   postmap /opt/zimbra/conf/recipient_bcc

4. Update email configuration to use sender_bcc and recipient_bcc files created above at path '/opt/zimbra/common/conf/main.cf'

   sender_bcc_maps = lmdb:/opt/zimbra/conf/sender_bcc
   recipient_bcc_maps = lmdb:/opt/zimbra/conf/recipient_bcc

5. Update ownership on files to zimbra:zimbra

   chown zimbra:zimbra /opt/zimbra/conf/sender_bcc* /opt/zimbra/conf/recipient_bcc*

6. Reload postfix configuration

   su - zimbra
   postfix reload
   zmmtactl restart

Ref:

• https://wiki.zimbra.com/wiki/Email_redirection
• https://www.huuphan.com/2017/08/create-auto-bcc-for-sender-mails-zimbra.html
• https://www.huuphan.com/2017/08/create-auto-bcc-for-recipient-mails-zimbra.html

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