Modifying Postfix message content

postfix

I am using postfix mail server and i need to replace mail content inside every incoming and outgoing message based on some predefined rules.

What is needed is to filter remote and local mail to replace every instance of user@domain.com in header or body with user@blah.com

header_checks and body_checks options seem cumbersome, maybe there is better/faster option that works on whole message instead going line by line

Best Answer

Postfix support header address rewriting at outgoing mail:

smtp_generic_maps = hash:/etc/postfix/generic_map

/etc/postfix/generic_map

user@example.com    user@example.org

# postmap /etc/postfix/generic_map

Using regular expression:

smtp_generic_maps = regexp:/etc/postfix/generic_map.regexp

/etc/postfix/generic_map

(.*?)@example.com    $1@example.org

Isn't supported change in body. You need create you own content filter.

http://www.postfix.org/postconf.5.html#smtp_generic_maps

Related Solutions

Prepend X-header to all relayed messages in Postfix

This answers your exact question: https://web.archive.org/web/20150706131729/http://hoursofop.tumblr.com/post/17760274650

Quick steps reported here:

create a file /etc/postfix/sendgrid_headers and add this line to it:

/^From:/ PREPEND X-SMTPAPI: {“category” : “Category Name”}

update your master.cf file with the following lines:

smtp      unix  -       -       n       -       -       smtp -o smtp_header_checks=regexp:/etc/postfix/sendgrid_header

It applies to a Ubuntu system and worked perfectly for me. Be careful to choose the right "smtp" line in master.cf. I used a tab to indent the -o line.

Also note that SendGrid strips out the X-SMTPAPI header from the email before it is sent on - so you won't find it there but you will see the category appear within the SendGrid dashboard.

Postfix header_checks using regexp proper setup

Solved - Following line in /etc/postfix/master.cf was causing conflict :

pickup    fifo  n       -       -       60      1       pickup
    -o content_filter=
#   -o receive_override_options=no_header_body_checks  //commented this line out

Best Answer

Related Solutions

Prepend X-header to all relayed messages in Postfix

Postfix header_checks using regexp proper setup

Related Topic