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This post shows how to set Email Piping for various mail servers –

EXIM MAIL SERVER

Open file — /etc/valiases/yourdomain.com

Assuming that we are setting up support@yourdomain.com,
sales@yourdomain.com, billing@yourdomain.com we will create the corresponding entries in the file as follows:

support@yourdomain.com: "|/full_path_to/manage/pipe.php"
sales@yourdomain.com: "|/full_path_to/manage/pipe.php"
billing@yourdomain.com: "|/full_path_to/manage/pipe.php"

Save the alias file and run this command on shell – newaliases This will add the alias file.

cPanel use exim mail server and you can set alias from cPanel too — cPanel >> Mail section Forwarders set –

support@yourdomain.com: "|/full_path_to/manage/pipe.php"
sales@yourdomain.com: "|/full_path_to/manage/pipe.php"
billing@yourdomain.com: "|/full_path_to/manage/pipe.php"

POSTFIX MAIL SERVER

Open alias file: generally its — /etc/postfix/aliases

You can check what alias file you have on your server — find line virtual_alias_maps in file /etc/postfix/main.cf

virtual_alias_maps = hash:/etc/postfix/aliases

So based on what is virtual_alias_maps set in main.cf you can edit respective file — in our case we will consider – /etc/postfix/aliases

Edit /etc/postfix/aliases and add below lines

support@yourdomain.com "|/full_path_to/manage/pipe.php"
sales@yourdomain.com "|/full_path_to/manage/pipe.php"
billing@yourdomain.com "|/full_path_to/manage/pipe.php"

Save the alias file and run this command on shell – newaliases This will add the alias file.

If you made any changes in main.cf then run command –
service postfix reload

Second method is using .forward file for piping.

1) Open alias file: generally its — /etc/postfix/aliases

You can check what alias file you have on your server — find line virtual_alias_maps in file /etc/postfix/main.cf

virtual_alias_maps = hash:/etc/postfix/aliases

So based on what is virtual_alias_maps set in main.cf you can edit respective file — in our case we will consider — /etc/postfix/aliases

Edit /etc/postfix/aliases and add below line (This line is for catch-all)

@yourdomain.com accountusername

2) and in /home/accountusername create .forward file with this line

/home/accountusername/public_html/support/manage/pipe.php

That’s it!

QMAIL MAIL SERVER

Open alias file:

/usr/local/qmail/mailnames/yourdomain.com/support/.qmail

The above alias file is for the email support@yourdomain.com. In certain installations the alias file can also be created as:

Alias File:

/usr/local/qmail/mailnames/company.com/.qmail-support

You should open the above alias files and point them to full path to manage/pipe.php, prefixed with the “|” (Pipe) symbol.

support@yourdomain.com: "|/full_path_to/manage/pipe.php"

SENDMAIL SERVER

Step 1: Add an alias in /etc/alias for support email. Be sure to rebuild the alias file after by typing newaliases at the command line.

support: "|/usr/bin/php -q /full_path_to/manage/pipe.php"

Step 2: chmod the script so it is executable:

chmod 755 /full_path_to/manage/pipe.php

Step 3: Create a symbolic link in /etc/smrsh so sendmail will know about script. If you don’t do this then sendmail will give error message Service unavailable, and smrsh: “php” not available for sendmail programs (stat failed).

cd /etc/smrsh
ln -s /usr/bin/php ./php
ln -s /full_path_to/manage/pipe.php ./pipe.php

Note that if you are installing a script on a virtual site you need to make the above changes in the virtual site files. So instead of adding links in /etc/smrsh you would add them in /home/virtual/siteXX/fst/etc/smrsh and instead of adding the alias in /etc/aliases, you would add them in /home/virtual/siteXX/fst/etc/aliases. Then to rebuild the aliases DB, you need to do this:

/usr/sbin/chroot /home/virtual/siteXX/fst newaliases