Hamilton, obrigado pelo retorno. Porem consegui resolver a situação, o
problema estava em varios pontos, solucionados utilizando o que descrevo
abaixo.

1 - O main.cf ficou assim (eliminei os comentarios nao relacionados com esta
situação):

smtpd_banner = $myhostname ESMTP $mail_name (Debian/GNU)
biff = no

append_dot_mydomain = no

readme_directory = no

smtpd_tls_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache

myhostname = host.dominio.com.br
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = dominio.com.br, host.dominio.com.br,
localhost.dominio.com.br, localhost
relayhost =
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all

message_size_limit = 10000000

# utilizando maildir
home_mailbox = Maildir/
mailbox_command = /usr/bin/procmail -a "$EXTENSION" DEFAULT=$HOME/Maildir/
MAILDIR=$HOME/Maildir/

# definindo restricoes
smtpd_recipient_restrictions = check_sender_access
hash:/etc/postfix/restricted_senders,
    permit_mynetworks,
    check_relay_domains
smtpd_restriction_classes = local_only
local_only = check_recipient_access hash:/etc/postfix/local_domains, reject

2 - O conteudo dos arquivos:

*cat restricted_senders*
[email protected] local_only

*cat local_domains*
dominio.com.br OK

3 - Executar o postmap

postmap /etc/postfix/restricted_senders
postmap /etc/postfix/local_domains
postfix reload

E pronto, a restrição está funcionando.

Os principais erros que apareceram no /var/log/mail.err foram:

Feb 15 02:46:20 nome_da_maquina postfix/smtpd[9148]: fatal: parameter
"smtpd_recipient_restrictions": specify at least one working instance of:
check_relay_domains, reject_unauth_destination, reject, defer or
defer_if_permit

Feb 15 04:21:25 Host postfix/smtpd[4776]: fatal: open database
/etc/postfix/restricted_senders.db: No such file or directory

Feb 15 04:28:32 Host postfix/smtpd[4908]: fatal: restriction class
`local_only' needs a definition


Att,

Tobias
http://gnu.eti.br

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