run script when postfix/dovecot get new mail

Question

I have:

postfix->dovecot-> new mail go to [aaaa@11111.xemple.com] mailbox 
postfix->dovecot-> new mail go to [aaaa@22222.xemple.com] mailbox 
postfix->dovecot-> new mail go to [aaaa@33333.xemple.com] mailbox 

I need run script when incoming mail comes and be saved by dovecot for domain 22222.xemple.com

how to make when the new email comes to aaaa@22222.xemple.com dovecot run script: sh /my/script/run/after/new/email/in/22222_xemple_com/run.sh

Answer 1

Use postfix transport!

1. add the user who will be run the command transpostfix

2. add to master.cf new transport:

   emailtransport   unix  -       n       n       -       -       pipe
       flags=X user=transpostfix  size=26214400 argv=/my/script/run/after/new/email/in/22222_xemple_com/run.sh
   

3. add to main.cf link to transport file

   transport_maps = hash:/etc/postfix/transport
   

4. edit transport file and run postmap

   #   postmap /etc/postfix/transport
   transpostfix@localhost.localhost    emailtransport:
   

5. add BCC. One mail go to Dovecot, second the same mail go to script. Edit in main.cf:

   recipient_bcc_maps = hash:/etc/postfix/recipient_bcc_maps
   

6. /etc/postfix/recipient_bcc_maps

   ###    postmap /etc/postfix/recipient_bcc_maps
   aaaa@11111.xemple.com run_script@example.commm
   

7. add in main.cf options virtual_alias_maps and redirect mail from run_script@example.commm goto transpostfix@localhost.localhost

Answer 2

With dovecot you can use pigeonhole.

Here is the official link for dovecot: https://wiki2.dovecot.org/Pigeonhole/Sieve/Plugins/Extprograms

it works together with the sieve server for filtering the mails so you can easily select which mails should be sent to your script.

Have fun Wim

Answer 3

use incron

/var/spool/incron:

/var/vmail/22222.xemple.com/aaaa/new IN_MOVED_TO,IN_ONESHOT /sys_my/postfix-mail/checker_postfix-parser.sh

--------------------- stop read! older solution is not good ---- I use ather programs for do it https://github.com/rvoicilas/inotify-tools/wiki#info

server: centos 6

script postfix-parser.sh to test if new letter comes to folder:

#!/bin/bash
###
### sh /sys_my/postfix-mail/postfix-parser.sh
while ((i<=END)); do
EVENT=$(inotifywait --format '%e' /var/vmail/22222.xemple.com/aaaa/new)
if [ "$EVENT" == "CREATE" ]; then 
echo $EVENT 
let ii++
echo $ii
fi
done

script checker_postfix-parser.sh to check if script run:

#!/bin/bash
###
# sh /sys_my/postfix-mail/checker_postfix-parser.sh

result=`ps aux | grep -i "postfix-parser.sh" | grep -v "grep" | wc -l`
if [ $result -ge 1 ]
   then
        echo "script is running"
   else
    sh /sys_my/postfix-mail/postfix-parser.sh
fi

add to startup: add this line:

sh /sys_my/postfix-mail/checker_postfix-parser.sh

to file:

/etc/rc.d/rc.local

run checker in cron every 5 min:

*/1 * * * * root sh /sys_my/postfix-mail/checker_postfix-parser.sh

Answer 4

I found the configuring of Dovecot to be a more elegant solution (as opposed to configuring Postfix) as @Wim suggests. The steps are as follows:

1. create your script (ie. mail_processor.py) in the /usr/lib/dovecot/sieve-execute/ directory:

   #!/usr/bin/python3
   from sys import stdin
   with open('/var/log/mail_processor.log', 'a') as logfile:
       for line in stdin:
           print(line.rstrip(), file=logfile)
   

   • ensure your script and target files have correct permissions:

     $ chmod +rx /usr/lib/dovecot/sieve-execute/mail_processor.py
     $ chmod 0777 /var/log/mail_processor.log
     

2. enable the sieve_extprograms plugin:

   • modify \etc\dovecot\conf.d\90-sieve.conf's plugin section with the following:

     sieve_extensions = +vnd.dovecot.execute
     sieve_plugins = sieve_extprograms
     sieve_execute_bin_dir = /usr/lib/dovecot/sieve-execute
     

   • reload dovecot:

     $ service dovecot restart
     

3. create sieve filter (ie. in Roundcube goto settings -> filters -> actions -> edit filter set):

   require ["vnd.dovecot.execute"];
   # rule:[mail processing]
   if true
   {
       execute :pipe "mail_processor.py";
   }
   

Now all mail delivered to any mailbox with this sieve filter will be piped through mail_processor.py for action.

Pigeonhole Sieve: Extprograms Plugin documentation for reference