Centos5.0 postfix mail loops

i have installed ISPconfig (newest version) on a CENTOS5 (perfect setup tutorial). everything works fine but if i send an email from any of the adresses the sender get the following error message again an again:

This is the mail system at host web1.pro-domain.eu.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to <postmaster>

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

The mail system

<[email protected]>: mail for
localhost.localdomain.pro-domain.eu loops back to myself
Reporting-MTA: dns; web1.pro-domain.eu
X-Postfix-Queue-ID: EBE9657EAE
X-Postfix-Sender: rfc822; [email protected]
Arrival-Date: Sun, 24 Jun 2007 17:55:51 +0200 (CEST)

Final-Recipient: rfc822; [email protected]
Original-Recipient: rfc822;[email protected]
Action: failed
Status: 5.4.6
Diagnostic-Code: X-Postfix; mail for localhost.localdomain.pro-domain.eu loops
back to myself

now i have two questions:
1.) how could i stop this
2.) i don´t know the reason for this, any cufiguration problem ?

maybe anyone could help me ?

regards
tomt2002

 

hello Till,

first of all thanks for your fast reply. your are right that i should search for an existing thread but i didn´t found that one.

anyway i have another question.

i added the line to the /etc/postfix/local-host-names and the problem is fixed.
localhost.localdomain.mydomain.com

but why is it necessary to add this line and why ISPConfig only add a line for each domain like www.mydomain.com and mydomain.com ?

 

Seems like ISPConfig couldn't figure out the hostname localhost.localdomain.mydomain.com. What are the outputs of

Code:

hostname -f

and

Code:

postconf -n

?

 

hostconf -f shows:
web1.pro-domain.eu

postconf -n shows:
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
broken_sasl_auth_clients = yes
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
html_directory = no
inet_interfaces = all
mail_owner = postfix
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = /etc/postfix/local-host-names
mynetworks = 127.0.0.0/8
newaliases_path = /usr/bin/newaliases.postfix
queue_directory = /var/spool/postfix
readme_directory = /usr/share/doc/postfix-2.3.3/README_FILES
sample_directory = /usr/share/doc/postfix-2.3.3/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtp_tls_note_starttls_offer = yes
smtp_use_tls = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination
smtpd_sasl_auth_enable = yes
smtpd_sasl_local_domain =
smtpd_sasl_security_options = noanonymous
smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
smtpd_tls_auth_only = no
smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt
smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
smtpd_use_tls = yes
tls_random_source = dev:/dev/urandom
unknown_local_recipient_reject_code = 550

best regards
tomt2002

 

Ok, then I also need the output of

Code:

postconf -d