How to configure Postfix to relay all incoming mails to my Python script Without checking if user exists on the system?

Question

I want to configure my Postfix server as accepting all incoming mails to any arbitrary users who don't have to exist on the system, say [email protected]. Now Postfix says, User unknown in local recipient table. What I want is to accept this e-mail without rejecting it and pipe it to my python script. Any help would be gladly appreciated.

Answer 1

You can use

luser_relay - Optional catch-all destination for unknown `local(8)` recipients. 

Add the following to your main.cf.

#/etc/postfix/main.cf
#...
#...
mydestination = $myhostname, localhost.$mydomain, localhost, mydomain.com
local_recipient_maps =
luser_relay = catchall
alias_maps = hash:/etc/aliases
#...
#...

and the following to your aliases file.

#/etc/aliases
catchall:  |/path/to/your/python_script.py

Run the following commands

postalias /etc/aliases
service postfix reload

and you can test the setup by following command

echo "test email"|mail -s 'Test email' [email protected]

Emails to unknown users will be delivered to the python script. Hope that helps.