Cannot send email via postfix / dovecot error status=deferred (mail transport unavailable)

I am trying to setup a mail server with postfix/dovecot/maria DB on centos 7 and have seem to hit a roadblock. I am not able to send emails to internal users and the logs suggest "mail transport unavailable". I checked few resources online and dont seem to find help, the services are up and running. /var/log/maillog Mar 9 21:30:41 server postfix/qmgr: 2222637E93F: from=, size=472, nrcpt=1 (queue active) Mar 9 21:30:41 server postfix/qmgr: warning: connect to transport private/dovecot: No such file or directory Mar 9 21:30:41 server postfix/error: 2222637E93F: to=, relay=none, delay=0.14, delays=0.09/0.03/0/0.02, dsn=4.3.0, status=deferred (mail transport unavailable) Mar 9 21:34:53 server postfix/pickup: 59F6E2D66A4: uid=0 from= Mar 9 21:34:53 server postfix/cleanup: 59F6E2D66A4: message-id= Mar 9 21:34:53 server postfix/qmgr: 59F6E2D66A4: from=, size=472, nrcpt=1 (queue active) Mar 9 21:34:53 server postfix/qmgr: warning: connect to transport private/dovecot: No such file or directory Mar 9 21:34:53 server postfix/error: 59F6E2D66A4: to=, relay=none, delay=0.17, delays=0.12/0.03/0/0.03, dsn=4.3.0, status=deferred (mail transport unavailable) Mar 9 21:35:22 server postfix/qmgr: C47911FB57A: from=, size=476, nrcpt=1 (queue active) Mar 9 21:35:22 server postfix/error: C47911FB57A: to=, relay=none, delay=540, delays=540/0/0/0, dsn=4.3.0, status=deferred (mail transport unavailable) I need to find out the source of the error.