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I could see that you are using dovecot type sasl. The communication between postfix smtp server and dovecot sasl works in two ways
UNIX-domain socket or over a TCP socket. Please let us know the dovecot version you are using. To check dovecot version simply run the following through command line
dovecot --version
Seems like from your main.cf, You are using UNIX-domain socket.
Also make sure that is a valid path private/auth-client. It is your Postfix queue directory.
>>smtpd_sasl_path = private/auth-client
Please paste your dovecot.conf, try to telnet to hostname port 25
make sure that your hostname is resolvable and having a valid rDNS.
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