SMTP issues - unable to connect : CentOS 6.5, Postfix, Dovecot, MySQL

Hi all

I'm trying to setup an email server on a CentOS system with Postfix, Dovecot and MySQL.

I'm following this article for an Ubuntu system: library.linode.com/email/postfix/postfix2.9.6-dovecot2.0.19-mysql

I can connect to the server using both secure pop/imap but can't with SMTP. I have tried sending an email from root and it remains in the queue. I get the follow error when the emails queue: connect to osiris.example.com[private/dovecot-lmtp]: No such file or directory

Here's the version that's installed on my system:

MySQL v5.5.36

Postfix v2.6.6

Dovecot v2.0.9

Thank you in advance.

Sophal

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