I use postfix (mysql virtual users) + amavis + spamassassin and configured spamassassin to use mysql for storing the bayes data:
use_bayes 1
bayes_auto_learn 1
bayes_store_module Mail::SpamAssassin::BayesStore::MySQL
bayes_sql_dsn DBI:mysql:<db>:localhost
bayes_sql_username <user>
bayes_sql_password <password>
In the mysql table "bayes_vars" I found only a row with the username "amavis".
Is it possible for spamassassin to use the e-mail address as username instead "amavis" for each mail?