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From: hobbzilla on 5 Mar 2007 14:26
GIVEN:
postfix-2.1.5-4.2.RHEL4
No other MTA on the server.

mail is handled for "domain.com" at an offsite 3rd party host.

myhostname is not set and therefore gets it's value from
gethostname().
hostname: myserver.domain.com

main.cf
=========================
queue_directory = /var/spool/postfix
command_directory = /usr/sbin
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
mydomain = domain.com
myorigin = $mydomain
inet_interfaces = localhost
mydestination = $myhostname, localhost
unknown_local_recipient_reject_code = 550
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
debug_peer_level = 2
debugger_command =
PATH=/bin:/usr/bin:/usr/local/bin:/usr/X11R6/bin
xxgdb $daemon_directory/$process_name $process_id & sleep 5
sendmail_path = /usr/sbin/sendmail.postfix
newaliases_path = /usr/bin/newaliases.postfix
mailq_path = /usr/bin/mailq.postfix
setgid_group = postdrop
html_directory = no
manpage_directory = /usr/share/man
sample_directory = /usr/share/doc/postfix-2.1.5/samples
readme_directory = /usr/share/doc/postfix-2.1.5/README_FILES
=========================

Currently:

If I perform a `mail -sTesting root < /dev/null` I receive the e-mail
fine via our 3rd party mail provider due to the fact there is a
distribution group with an SMTP alias of "root" setup. However if I
perform a `mail -sTesting postfix < /dev/null`, I do not receive an e-
mail to root as expected (there is an /etc/aliases entry: postfix:
root ), but rather my 3rd party mail provider bounces back a "550
5.1.1 User unknown" error for the 3rd party host (not a 550 from
myserver.domain.com).

I have performed "newaliases" and "postalias" and "/etc/init.d/postfix
reload/restart/stop/start" all to no avail.

I have also tried adding an alias of
postfix: someuser(a)yahoo.com

and performing "newaliases" and "postfix reload" it still comes back
undeliverable from the 3rd party mail host.

It is like the aliases are not being read at all and any mail sent to
<username> ends up trying to go to username(a)domain.com (hosted at the
3rd party). How can I not bypass the aliases for this situation? Do I
need to use something besides aliases? I'm at a loss. Thanks in
advance!

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