Setup a Postfix outgoing BCC based on SMTP username (not sending email address)

postfix

Our goal is to have a copy of any email sent by a specific SMTP user account bcc'd to another email address.

With Postfix, we can setup an outgoing email address to always BCC another address on messages that are sent.

This can be done with a line in main.cf:

sender_bcc_maps = hash:/etc/postfix/sender_bcc

And then in /etc/postfix/sender_bcc:

user@company.com bcc@company.com

But if the user simply changes thier outgoing mail settings to send mail as user1@company.com, the BCC breaks. What the user can't change, however, is their SMTP username.

So we really need a way to setup Postfix to create a BCC when a message is sent by an SMTP user logged in as user, regardless of what email address that person claims to have.

Is this possible? How?

Best Answer

You may use reject_sender_login_mismatch to force match between smtp auth and envelope sender address. It may deliver solution acceptable for most situations.

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Help: Setup Outgoing Mail Server Only for Multiple Domains Using Postfix

Since you're running Ubuntu, you should be able to get a functional postfix setup by running

dpkg-reconfigure postfix

This should run a dialog that asks you a series of questions. One of the questions will be along the lines of "Other destinations to accept mail for", to which you should reply with an empty string (i.e. blank). You should also be certain to give a valid email address (e.g. yours) in answer to the question "Root and postmaster mail recipient", so that mail generated by the system by/for system users gets delivered somewhere.

How to setup Postfix to accept all email and send to a specific address

figured it out. I was missing some entries in my main.cf file:

smtpd_recipient_restrictions = permit_mynetworks, permit_auth_destination, reject

virtual_alias_maps = hash:/etc/postfix/virtual

local_recipient_maps =

making the full main.cf:

# See /usr/share/postfix/main.cf.dist 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 (Ubuntu)
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_cert_file=/etc/ssl/certs/ssl-cert-snakeoil.pem
smtpd_tls_key_file=/etc/ssl/private/ssl-cert-snakeoil.key
smtpd_use_tls=yes
smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache
smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache
smtpd_reject_unlisted_recipient = no
smtpd_recipient_restrictions = permit_mynetworks, permit_auth_destination, reject

# See /usr/share/doc/postfix/TLS_README.gz in the postfix-doc package for
# information on enabling SSL in the smtp client.

myhostname = server1.helpmeco.de
alias_maps = hash:/etc/aliases
alias_database = hash:/etc/aliases
myorigin = /etc/mailname
mydestination = helpmeco.de, server1.helpmeco.de, localhost.helpmeco.de, localhost
relayhost = 
mynetworks = 127.0.0.0/8 [::ffff:127.0.0.0]/104 [::1]/128
mailbox_command = 
mailbox_size_limit = 0
recipient_delimiter = +
inet_interfaces = all
home_mailbox = Maildir/

virtual_alias_maps = hash:/etc/postfix/virtual

local_recipient_maps =

Best Answer

Related Solutions

Help: Setup Outgoing Mail Server Only for Multiple Domains Using Postfix

How to setup Postfix to accept all email and send to a specific address

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