How to add a Disclaimer To Outgoing Emails in Postfix
Posted by Admin on May 15th, 2008
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alterMIME is a small program which is used to alter your mime-encoded mailpacks as typically received by Inflex, Xamime and AMaViS.
What can alterMIME do?
Insert disclaimers
Insert arbitary X-headers
Modify existing headers
Remove attachments based on filename or content-type
Replace attachments based on filename
Installing alterMIME in debian
Use the following command to install altermime
#aptitude install altermime
This will complete the installation.
Configure altermime
Next we need to create the user filter with the home directory /var/spool/filter filter - alterMIME will be run as that user
#useradd -r -c “Postfix Filters” -d /var/spool/filter filter
#mkdir /var/spool/filter
#chown filter:filter /var/spool/filter
#chmod 750 /var/spool/filter
Afterwards we create the script /etc/postfix/disclaimer which executes alterMIME. Debian’s alterMIME package comes with a sample script that we can simply copy to /etc/postfix/disclaimer
#cp /usr/share/doc/altermime/examples/postfix_filter.sh /etc/postfix/disclaimer
#chgrp filter /etc/postfix/disclaimer
#chmod 750 /etc/postfix/disclaimer
Now we need to add disclaimer to only outgoing email
we create the file /etc/postfix/disclaimer_emails which holds all sender email addresses (one per line) for which alterMIME should add a disclaimer
#vi /etc/postfix/disclaimer_emails
admin@domain.com
user1@domain.org
Save and exit the file
Now we open /etc/postfix/disclaimer and modify some configuration you can check this file
Next we need the text file /etc/postfix/disclaimer.txt which holds our disclaimer text. Debian’s alterMIME package comes with a sample text that we can use for now
#cp /usr/share/doc/altermime/examples/disclaimer.txt /etc/postfix/disclaimer.txt
Finally we have to tell Postfix that it should use the /etc/postfix/disclaimer script to add disclaimers to outgoing emails. Open /etc/postfix/master.cf and add -o content_filter=dfilt: to the smtp line:
#vi /etc/postfix/master.cf
# # Postfix master process configuration file. For details on the format # of the file, see the master(5) manual page (command: “man 5 master”). # # ========================================================================== # service type private unpriv chroot wakeup maxproc command + args # (yes) (yes) (yes) (never) (100) # ==========================================================================
smtp inet n - - - - smtpd
-o content_filter=dfilt: [...]
at the end of the file add the following lines
[...]
dfilt unix - n n - - pipe
flags=Rq user=filter argv=/etc/postfix/disclaimer -f ${sender} -- ${recipient}
Save and exit the file.
Now you need to restart the postfix mail server using the following command
#/etc/init.d/postfix restart
May 30th, 2008 at 4:57 am
Hi there,
I set this up - but the HTML isn’t being parsed properly by Outlook 2007.
It puts a few = signs into the body of the HTML disclaimer, it happens when it’s sent as plaintext and HTML.
Any ideas? I can’t figure it out!
Cheers,
Andrew
October 11th, 2008 at 6:46 am
Help needed,
I am using Fedora core 6 and I had tried to add disclamer as per the instructions in this page, also googled and tried lots of other ways too.
But when ever I try to send mail and cheks the maillog, its showing this error, and the mail is not send at all
I am pasting the error from /etc/log/maillog
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Oct 11 08:22:38 it001 pipe[5108]: fatal: pipe_command: execvp /etc/postfix/disclaimer: Permission denied
Oct 11 08:22:38 it001 sendmail[5102]: m9BCMcLV005102: to=test@test.com, ctladdr=root (0/0), delay=00:00:00, xdelay=00:00:00, mailer=relay, pri=30063, relay=[127.0.0.1] [127.0.0.1], dsn=2.0.0, stat=Sent (Ok: queued as 981A050068)
Oct 11 08:22:38 it001 postfix/pipe[5107]: 981A050068: to=, relay=dfilt, delay=0.09, delays=0.06/0.01/0/0.02, dsn=4.3.0, status=deferred (temporary failure. Command output: pipe: fatal: pipe_command: execvp /etc/postfix/disclaimer: Permission denied )
Oct 11 08:22:38 it001 postfix/smtpd[5103]: disconnect from it001[127.0.0.1]
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