ISPCONFIG - POSTFIX "Relay Access Denied" Impossibile inviare email

[dail]

Ciao a tutti
Ho installato ISPCONFIG nel mio server linux.
Ho un problema con gli account email, riesco a ricevere correttamente
email ma NON ad inviarle..
La cosa strana che tramite webmail funziona tutto, quando tento
l'invio da thunderbird non funziona.

Riporto qui il file main.cf di postfix:

# See /usr/share/postfix/main.cf.dist for a commented, more complete
version


# Debian specific:  Specifying a file name will cause the first
# line of that file to be used as the name.  The Debian default
# is /etc/mailname.
#myorigin = /etc/mailname

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

# appending .domain is the MUA's job.
append_dot_mydomain = no

# Uncomment the next line to generate "delayed mail" warnings
#delay_warning_time = 4h

# TLS parameters
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:${queue_directory}/
smtpd_scache
smtp_tls_session_cache_database = btree:${queue_directory}/smtp_scache

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package
for
# information on enabling SSL in the smtp client.

myhostname = mail.MIODOMINIO.com
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = mail.MIODOMINIO.com, localhost, localhost.localdomain,
localhost
smtpd_recipient_restrictions =
permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination,check_policy_service
unix:private/policy

#relayhost =
mynetworks = 127.0.0.0/8 78.46.101.15
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all

virtual_maps = hash:/etc/postfix/virtusertable

Ecco il file log che leggo in /var/log/mail.log

Nov  3 16:30:45 Debian-40-etch-64-LAMP postfix/smtpd[12540]: connect
from 111-111-111-111.fastres.net[111.111.111.111]
Nov  3 16:30:46 Debian-40-etch-64-LAMP postfix/smtpd[12540]: NOQUEUE:
reject: RCPT from 111-111-111-111.fastres.net[111.111.111.111]: 554
5.7.1 <MIOACCOUNT@gmail.com>: Relay access denied;
from=<damiano@MIODOMINIO.com> to=<MIOACCOUNT@gmail.com> proto=ESMTP
helo=<[127.0.0.1]>
Nov  3 16:30:48 Debian-40-etch-64-LAMP postfix/smtpd[12540]:
disconnect from 111-111-111-111.fastres.net[111.111.111.111]

Cosa devo modificare?

Grazie mille

[sacarde]

dovrebbe essere:

relayhost =

inserisci un server smtp