You can setup Zimbra CS as a gateway for HylaFax users to send fax out using the scheme <fax number>@fax.our.domain, following these steps: Edit file /opt/zimbra/postfix/conf/master.cf, append this line: fax unix – n n – 1 pipe flags= user=uucp argv=/usr/bin/faxmail -d -n ${user} Edit file /opt/zimbra/postfix/conf/transport, append this line: fax.your.domain fax:localhost And then use thisContinue reading “Zimbra and Hylafax integration”