> smtp_sasl_password_maps is configured with a connection parameter to db 
> connection and a simply select query.
> [...]
> if i use external smarthost, this mail is always sent regularly.

I am also not sure what you want to achieve:

https://www.postfix.org/postconf.5.html#smtp_sasl_password_maps

#######################
smtp_sasl_password_maps (default: empty)

Optional Postfix SMTP client lookup tables with one username:password entry per 
sender, remote hostname or next-hop domain. Per-sender lookup is done only when 
sender-dependent authentication is enabled. If no username:password entry is 
found, then the Postfix SMTP client will not attempt to authenticate to the 
remote host.
#######################

smtp_* keys are for outgoing connections, like with your external smarthost.

With smtp_sasl_password_maps you can configure credentials that are used when
you are submitting emails via an external smarthost that requires smtp
authentification.

In case you want postfix to send mails directly you don't need 
smtp_sasl_password_maps.
In case you want to authenticate your own users submitting mails via submission 
(e.g. port 587)
you need other means like saslauthd or dovecot.

Best regards,
Gerald
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