I'm having a problem getting postfix to ignore an mx record and
forward directly to a specific host. Basically I have a content filter I
wrote that just accepts the e-mail from postfix on stdin and reinjects
it as an smtp delivery to another port on the same host. I need the
second port to forward it irregardless of any mx records to a specific
host. Here's postconf -n:

alias_database = hash:/etc/postfix/aliases
alias_maps = hash:/etc/postfix/aliases
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
mail_owner = postfix
mailq_path = /usr/bin/mailq
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain $mydomain
mynetworks = 127.0.0.0/8
myorigin = $mydomain
newaliases_path = /usr/bin/newaliases
queue_directory = /var/spool/postfix
readme_directory = /etc/postfix/README_FILES
relay_domains = $mydestination, mydomain.com
sample_directory = /etc/postfix/samples
sendmail_path = /usr/sbin/sendmail
setgid_group = postdrop

And my master.cf
smtp inet n - y - - smtpd
        -o content_filter=filter:
filter unix - n n - - pipe
        flags=R user=apache argv=/usr/local/bin/myfilter -r ${recipient}
-s ${sender} localhost:10025 inet n - n - -
smtpd -o content_filter=
        -o local_recipient_maps=
        -o transport_maps=hash:/etc/postfix/transport
pickup fifo n - y 60 1 pickup
cleanup unix n - y - 0 cleanup
qmgr fifo n - y 300 1 qmgr
#qmgr fifo n - n 300 1 nqmgr
rewrite unix - - y - - trivial-rewrite
bounce unix - - y - 0 bounce
defer unix - - y - 0 bounce
flush unix n - y 1000? 0 flush
smtp unix - - y - - smtp
showq unix n - y - - showq
error unix - - y - - error
local unix - n n - - local
virtual unix - n y - - virtual
lmtp unix - - y - - lmtp

The transport file contains:

mydomain.com smtp:[mailhub.mydomain.com]
.mydomain.com smtp:[mailhub.mydomain.com]

Reading the documentation on transport maps I would have thought that
putting braces around mailhub.mydomain.com would cause postfix to ignore
any associated MX records, but that appears not to be the case.
Originally I attempted to just set relayhost=[mailhub.mydomain.com] in
main.cf but that didn't work either. I keep getting an error about this
system being the best MX record and causing a mail loop, which is
correct, since this host IS the only MX record, but once it has done
what it needs to do with the mail I need to forward it onwards to its
actual destination, mailhub.mydomain.com.

I'm sure I must be overlooking something obvious since all those virus
scanning filters must work this way too. If someone could hit me with
the clue stick I'd appreciate it.

    Thanks,
        -Scott

-- 
Scott Lampert
<scottlampert.org>
"They that can give up essential liberty to obtain a little temporary
safety deserve neither liberty nor safety."
-Benjamin Franklin, 1759
Public Key: http://www.lampert.org/lampert.key

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