Hello all,
I am using Postfix as a mail relay to a mail server running Sendmail.
I configured Postfix using documentation from the website
freespamfilter.org. All is working fine, but I am having the following
problem:

Whenever someone sends an email to anyone else, with an address to my
domain in the BCC field, the recipient (the To: in this case) gets 2
copies of the email. For instance, if I'm using Yahoo! mail and send an
email To: <address@hotmail.com>, and Bcc: <address@mydomain.com>, the
Hotmail account receives 2 copies of the message. The headers show that
one message is from Yahoo and the other is from <mydomain>.

I believe the problem may be on my Postfix server because if I send
mail like this from the Sendmail server, the problem doesnt occur. I
will eventually get rid of the Sendmail server, which will probably
remove the problem altogether, but I need it currently. Hopefully,
this is a simple fix. I'd appreciate any assistance you can offer, and,
please be gentle; I am using Postfix because I think it is easier and
better than Sendmail, but email servers is something I'm just starting
to learn. Thanx.

Here is my postconf output (domain/IP addrs changed to protect the
innocent):
alias_database = hash:/etc/aliases
alias_maps = hash:/etc/aliases
biff = no
command_directory = /usr/sbin
config_directory = /etc/postfix
daemon_directory = /usr/libexec/postfix
debug_peer_level = 2
empty_address_recipient = MAILER-DAEMON
html_directory = no
inet_interfaces = all
local_recipient_maps =
local_transport = local
mail_owner = postfix
mailbox_size_limit = 1000000000
mailq_path = /usr/bin/mailq.postfix
manpage_directory = /usr/share/man
mydestination = $myhostname, localhost.$mydomain, localhost
mydomain = mydomain.com
myhostname = mail.mydomain.com
mynetworks = 192.168.0.0/8, ..., 127.0.0.0/8
myorigin = $myhostname
newaliases_path = /usr/bin/newaliases.postfix
notify_classes = protocol,resource,software
queue_directory = /var/spool/postfix
queue_minfree = 120000000
readme_directory = /usr/share/doc/postfix-2.1.5/README_FILES
relay_domains = hash:/etc/postfix/relay_domains
sample_directory = /usr/share/doc/postfix-2.1.5/samples
sendmail_path = /usr/sbin/sendmail.postfix
setgid_group = postdrop
smtpd_banner = $myhostname ESMTP
smtpd_recipient_restrictions = permit_mynetworks,
reject_unauth_destination,
reject_non_fqdn_recipient
soft_bounce = yes
transport_maps = hash:/etc/postfix/transport
unknown_local_recipient_reject_code = 550
virtual_alias_maps = hash:/etc/postfix/virtual

transport:
mydomain: smtp[<ip address of Sendmail server>]

relay_domains:
mydomain OK

linmail wrote:
I believe the problem may be on my Postfix server because if I send
mail like this from the Sendmail server, the problem doesnt occur.

Try sending from the Postfix server directly to the Internet, without
relaying through the Sendmail server, and I bet the issue disappears.

In other words, the Sendmail relay is probably doing it.

--
Greg





> Hello all,
> I am using Postfix as a mail relay to a mail server running Sendmail.
> I configured Postfix using documentation from the website
> freespamfilter.org. All is working fine, but I am having the following
> problem:
>
> Whenever someone sends an email to anyone else, with an address to my
> domain in the BCC field, the recipient (the To: in this case) gets 2
> copies of the email. For instance, if I'm using Yahoo! mail and send an
> email To: <address@hotmail.com>, and Bcc: <address@mydomain.com>, the
> Hotmail account receives 2 copies of the message. The headers show that
> one message is from Yahoo and the other is from <mydomain>.
>
> I believe the problem may be on my Postfix server because if I send
> mail like this from the Sendmail server, the problem doesnt occur. I
> will eventually get rid of the Sendmail server, which will probably
> remove the problem altogether, but I need it currently. Hopefully,
> this is a simple fix. I'd appreciate any assistance you can offer, and,
> please be gentle; I am using Postfix because I think it is easier and
> better than Sendmail, but email servers is something I'm just starting
> to learn. Thanx.
>
> Here is my postconf output (domain/IP addrs changed to protect the
> innocent):
> alias_database = hash:/etc/aliases
> alias_maps = hash:/etc/aliases
> biff = no
> command_directory = /usr/sbin
> config_directory = /etc/postfix
> daemon_directory = /usr/libexec/postfix
> debug_peer_level = 2
> empty_address_recipient = MAILER-DAEMON
> html_directory = no
> inet_interfaces = all
> local_recipient_maps =
> local_transport = local
> mail_owner = postfix
> mailbox_size_limit = 1000000000
> mailq_path = /usr/bin/mailq.postfix
> manpage_directory = /usr/share/man
> mydestination = $myhostname, localhost.$mydomain, localhost
> mydomain = mydomain.com
> myhostname = mail.mydomain.com
> mynetworks = 192.168.0.0/8, ..., 127.0.0.0/8
> myorigin = $myhostname
> newaliases_path = /usr/bin/newaliases.postfix
> notify_classes = protocol,resource,software
> queue_directory = /var/spool/postfix
> queue_minfree = 120000000
> readme_directory = /usr/share/doc/postfix-2.1.5/README_FILES
> relay_domains = hash:/etc/postfix/relay_domains
> sample_directory = /usr/share/doc/postfix-2.1.5/samples
> sendmail_path = /usr/sbin/sendmail.postfix
> setgid_group = postdrop
> smtpd_banner = $myhostname ESMTP
> smtpd_recipient_restrictions = permit_mynetworks,
> reject_unauth_destination,
> reject_non_fqdn_recipient
> soft_bounce = yes
> transport_maps = hash:/etc/postfix/transport
> unknown_local_recipient_reject_code = 550
> virtual_alias_maps = hash:/etc/postfix/virtual
>
> transport:
> mydomain: smtp[<ip address of Sendmail server>]
>
> relay_domains:
> mydomain OK
>