This time, it’s about limiting email certain user on Zimbra to only send email to local domain on certain domain.

Edit /opt/zimbra/conf/zmconfigd/ and add below line after permit_sasl_authneticated

Edit  /opt/zimbra/conf/ file and add line below at postfix groups before “RESTART mta” line.

Create new file  /opt/zimbra/conf/  with below lines.

Now, create the files /opt/zimbra/postfix/conf/restricted_senders and list the restricted user on the file. Example;

Create /opt/zimbra/postfix/conf/local_domains. This will be the list where the restricted sender above. Example;

Now, update the all lmdb files above and restart zimbra mta

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