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heres what i get in my /var/log/auth.log;
Jan 31 13:39:30 aeisecurity postfix/smtpd[13526]: sql_select option missing
Jan 31 13:39:30 aeisecurity postfix/smtpd[13526]: auxpropfunc error no mechanism available
Jan 31 13:39:30 aeisecurity postfix/smtpd[13526]: _sasl_plugin_load failed on sasl_auxprop_plug_init for plugin: sql
Jan 31 13:39:52 aeisecurity postfix/smtpd[13527]: sql_select option missing
Jan 31 13:39:52 aeisecurity postfix/smtpd[13527]: auxpropfunc error no mechanism available
Jan 31 13:39:52 aeisecurity postfix/smtpd[13527]: _sasl_plugin_load failed on sasl_auxprop_plug_init for plugin: sql
Jan 31 13:39:53 aeisecurity postfix/smtpd[13528]: sql_select option missing
Jan 31 13:39:53 aeisecurity postfix/smtpd[13528]: auxpropfunc error no mechanism available
Jan 31 13:39:53 aeisecurity postfix/smtpd[13528]: _sasl_plugin_load failed on sasl_auxprop_plug_init for plugin: sql
I apologize, the command I suggest does get rid of that particular error, but only generates other annoying errors.
The dependency on libsasl2-modules-sql has been removed from Virtualmin, when I notified Joe about this. Update your Virtualmin packages and remove the libsasl2-modules-sql package. Errors should cease.
Not sure what's going on with your permission denied errors, but I do know you can get rid of the sql_select errors by adding the following to /etc/postfix/sasl/smtpd.conf:
sql_select: dummy