Weird "from" address in Postfix sent mails


I just installed another WebMin+VirtualMin server on a Debian 5.0 x64 machine using the now famous “” :slight_smile: Like my past experiences, smooth install !

My client just have a problem sending mail from his domains : the mail leaves the server but the “from” header is weird: “user.domain@localhost” instead of classical “user@domain.tld”. So, if the destination host do a verification on the address, the message is bounced with this error : “550-Verification failed for user.domain@localhost / 550-Unrouteable address / 550 Sender verify failed (in reply to RCPT TO command)”. If the destination host doesn’t do verification, the mail is delivered.

I compared the configuration with another server I set up few month ago (but without this weird behavior) : identical.

So, I am here to ask for some advices. I tried one found on this forum ( with no luck.

hostname :


/etc/hosts :

[code] localhost sd-XXXXX

The following lines are desirable for IPv6 capable hosts

::1 localhost ip6-localhost ip6-loopback[/code]
/etc/postfix/ :

[code]# See /usr/share/postfix/ 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

readme_directory = no

TLS parameters

smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_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 =
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
mydestination = localhost,,, localhost
mynetworks = [::ffff:]/104 [::1]/128
mailbox_command = /usr/bin/procmail-wrapper -o -a $DOMAIN -d $LOGNAME
mailbox_size_limit = 0
recipient_delimiter = +
virtual_alias_maps = hash:/etc/postfix/virtual
sender_bcc_maps = hash:/etc/postfix/bcc
home_mailbox = Maildir/
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_mynetworks permit_sasl_authenticated reject_unauth_destination

Thanks for your help and your time,


Make sure that in /etc/host, the full hostname is listed there: sd-XXXXX