Something

auth.log:

Jul 19 12:10:46 kirby postfix/smtpd[8116]: SQL engine 'mysql ' not supported
Jul 19 12:10:46 kirby postfix/smtpd[8116]: auxpropfunc error no mechanism available 
Jul 19 12:10:46 kirby postfix/smtpd[8116]: _sasl_plugin_load failed on sasl_auxprop_plug_init for plugin: sql 
Jul 19 12:10:46 kirby postfix/smtpd[8119]: SQL engine 'mysql ' not supported
Jul 19 12:10:46 kirby postfix/smtpd[8119]: auxpropfunc error no mechanism available 
Jul 19 12:10:46 kirby postfix/smtpd[8119]: _sasl_plugin_load failed on sasl_auxprop_plug_init for plugin: sql

***************

mail.log:

Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 220 kirby.voltaiccommerce.com ESMTP Postfix (Ubuntu)
Jul 19 12:10:47 kirby postfix/smtpd[8116]: < unknown[192.168.1.135]: EHLO [192.168.1.135]
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 250-kirby.voltaiccommerce.com
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 250-PIPELINING
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 250-SIZE 10240000
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 250-ETRN
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 250-AUTH LOGIN CRAM-MD5
Jul 19 12:10:47 kirby postfix/smtpd[8116]: match_list_match: unknown: no match
Jul 19 12:10:47 kirby postfix/smtpd[8116]: match_list_match: 192.168.1.135: no match
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 250-AUTH=LOGIN CRAM-MD5
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 250 8BITMIME
Jul 19 12:10:47 kirby postfix/smtpd[8116]: < unknown[192.168.1.135]: AUTH CRAM-MD5
Jul 19 12:10:47 kirby postfix/smtpd[8116]: smtpd_sasl_authenticate: sasl_method CRAM-MD5
Jul 19 12:10:47 kirby postfix/smtpd[8116]: smtpd_sasl_authenticate: uncoded challenge: <4027014737.12474827@kirby.voltaiccommerce.com>
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 334 PDQwMjcwMTQ3MzcuMTI0NzQ4MjdAa2lyYnkudm9sdGFpY2NvbW1lcmNlLmNvbT4=
Jul 19 12:10:47 kirby postfix/smtpd[8116]: < unknown[192.168.1.135]: bmlja0BiYXJ0b25zcGxhY2UubmV0IGViYzkzMzE2M2Q5NjNiMDNlZTc1ZDQ1ZWI1YzgzNDhl
Jul 19 12:10:47 kirby postfix/smtpd[8116]: smtpd_sasl_authenticate: decoded response: nick@bartonsplace.net ebc933163d963b03ee75d45eb5c8348e
Jul 19 12:10:47 kirby postfix/smtpd[8116]: warning: SASL authentication failure: no secret in database
Jul 19 12:10:47 kirby postfix/smtpd[8116]: warning: unknown[192.168.1.135]: SASL CRAM-MD5 authentication failed
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 535 Error: authentication failed
Jul 19 12:10:47 kirby postfix/smtpd[8116]: < unknown[192.168.1.135]: QUIT
Jul 19 12:10:47 kirby postfix/smtpd[8116]: > unknown[192.168.1.135]: 221 Bye
Jul 19 12:10:47 kirby postfix/smtpd[8116]: match_hostname: unknown ~? host
Jul 19 12:10:47 kirby postfix/smtpd[8116]: match_hostaddr: 192.168.1.135 ~? host
Jul 19 12:10:47 kirby postfix/smtpd[8116]: match_list_match: unknown: no match
Jul 19 12:10:47 kirby postfix/smtpd[8116]: match_list_match: 192.168.1.135: no match
Jul 19 12:10:47 kirby postfix/smtpd[8116]: send attr request = disconnect
Jul 19 12:10:47 kirby postfix/smtpd[8116]: send attr ident = smtp:192.168.1.135
Jul 19 12:10:47 kirby postfix/smtpd[8116]: private/anvil: wanted attribute: status
Jul 19 12:10:47 kirby postfix/smtpd[8116]: input attribute name: status
Jul 19 12:10:47 kirby postfix/smtpd[8116]: input attribute value: 0
Jul 19 12:10:47 kirby postfix/smtpd[8116]: private/anvil: wanted attribute: (list terminator)
Jul 19 12:10:47 kirby postfix/smtpd[8116]: input attribute name: (end)
Jul 19 12:10:47 kirby postfix/smtpd[8116]: disconnect from unknown[192.168.1.135]