What is the problem with the configuration?
I have other server with de same relay ISP, but with postfix manual installation and this work fine.


mail.log
##############################################
EA8D57C211F: to=<laercio@kleber.com.br>, relay=smtp.isp.com.br[200.198.xx.xx]:587, delay=42456, delays=42456/0.04/0.18/0.07, dsn=4.1.8, status=deferred (host smtp.isp.com.br[200.198.xx.xx] said: 450 4.1.8 <laercio@laercio.adm.br>: Sender address rejected: Domain not found (in reply to RCPT TO command))


main.cf
##################### relay em provedor externo ##########################
relayhost = smtp.isp.com.br:587
smtp_sasl_auth_enable = yes
smtp_sasl_security_options = noanonymous
smtp_sasl_password_maps = hash:/opt/zimbra/postfix/conf/saslviars
#smtp_cname_overrides_servername = no
relay_domains = 192.168.1.1/24, 127.0.0.0/8