/etc/postfix/main.cf

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

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

myhostname = debianserver
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = $myhostname, /etc/postfix/virtual/domains
virtual_alias_domains = demuldertjes.com familiebeheer.nl
virtual_maps  = hash:/etc/postfix/virtual/addresses
relayhost = smtp.orange.nl
mynetworks = 127.0.0.0/8 10.0.0.0/24
mailbox_command = procmail -a "$EXTENSION"
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
append_dot_mydomain = no
swap_bangpath = no
append_at_myorigin = no
allow_percent_hack = no

/etc/postfix/virtual/addresses

knowledgeshare.nl              DOMAIN
diamond@knowledgeshare.nl      diamond
support@knowledgeshare.nl      support
services@knowledgeshare.nl     services
@knowledgeshare.nl             diamond

demuldertjes.com               DOMAIN
corne@demuldertjes.com         corne
jolien@demuldertjes.com        jolien
arnoud@demuldertjes.com        arnoud
timo@demuldertjes.com          timo
evert@demuldertjes.com         evert
@demuldertjes.com              support

errors : 

Mar 21 14:47:40 Debianserver postfix/local[12330]: 1A10E32C2C: to=<diamond@debianserver>, orig_to=<root>, relay=local, delay=1, status=sent (delivered to command: procmail -a "$EXTENSION")

==> /var/log/syslog <==
Mar 21 14:47:39 Debianserver postfix/smtp[12323]: E746B32C27: to=<DaimonD_M@hotmail.com>, relay=smtp.orange.nl[193.252.22.234], delay=16, status=bounced (host smtp.orange.nl[193.252.22.234] said: 504 <root>: Sender address rejected: need fully-qualified address (in reply to RCPT TO command))
Mar 21 14:47:39 Debianserver postfix/smtp[12321]: C807132C2A: to=<DaimonD_M@hotmail.com>, relay=smtp.orange.nl[193.252.22.251], delay=62, status=bounced (host smtp.orange.nl[193.252.22.251] said: 504 <root>: Sender address rejected: need fully-qualified address (in reply to RCPT TO command))
Mar 21 14:47:39 Debianserver postfix/smtp[12322]: D522C32A5C: to=<DaimonD_M@hotmail.com>, relay=smtp.orange.nl[193.252.22.233], delay=38, status=bounced (host smtp.orange.nl[193.252.22.233] said: 504 <root>: Sender address rejected: need fully-qualified address (in reply to RCPT TO command))
Mar 21 14:47:39 Debianserver postfix/cleanup[12319]: EDBF832C29: message-id=<20070321134739.EDBF832C29@debianserver>

==> /var/log/mail.log <==
Mar 21 14:47:39 Debianserver postfix/smtp[12323]: E746B32C27: to=<DaimonD_M@hotmail.com>, relay=smtp.orange.nl[193.252.22.234], delay=16, status=bounced (host smtp.orange.nl[193.252.22.234] said: 504 <root>: Sender address rejected: need fully-qualified address (in reply to RCPT TO command))
Mar 21 14:47:39 Debianserver postfix/smtp[12321]: C807132C2A: to=<DaimonD_M@hotmail.com>, relay=smtp.orange.nl[193.252.22.251], delay=62, status=bounced (host smtp.orange.nl[193.252.22.251] said: 504 <root>: Sender address rejected: need fully-qualified address (in reply to RCPT TO command))
Mar 21 14:47:39 Debianserver postfix/smtp[12322]: D522C32A5C: to=<DaimonD_M@hotmail.com>, relay=smtp.orange.nl[193.252.22.233], delay=38, status=bounced (host smtp.orange.nl[193.252.22.233] said: 504 <root>: Sender address rejected: need fully-qualified address (in reply to RCPT TO command))
Mar 21 14:47:39 Debianserver postfix/cleanup[12319]: EDBF832C29: message-id=<20070321134739.EDBF832C29@debianserver>