Ohh GREAT Noel! that sorted the issue out ..

I was using roundcube to test this but once you specified that its using
sendmail instead of smtp it clicked the right button, roundcube by default
uses available mta and do not look for smtp auth. I have adjusted roundcube
to go for smtp and it worked like charm. For other users references, this is
the final conf which worked for me as expected :

main.cf :
smtpd_recipient_restrictions = check_sender_access
hash:/etc/postfix/restricted_senders,permit_mynetworks,permit_sasl_authenticated,check_client_access
mysql:/etc/postfix/mysql_popbsmtp_access_maps.cf,check_client_access
hash:/etc/postfix/relay,reject_unauth_destination
smtpd_restriction_classes = localonly
localonly = check_recipient_access hash:/etc/postfix/localdomains, reject
smtpd_sasl_path = private/auth
smtpd_sasl_type = dovecot

Roundcube main.inc.php :
$rcmail_config['smtp_server'] = 'tls://%h';
$rcmail_config['smtp_port'] = 25;
$rcmail_config['smtp_user'] = '%u';
$rcmail_config['smtp_pass'] = '%p';

Thanks guys! Now I just need to find the button for "marked as solved" :)



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