IndiMail Queue Mechanism

Indimail has the ability of configuring multiple local and remote queues. A queue is a location on your hard disk where email are deposited before actual delivery. When you have massive injecting rates, your software may place multiple files in a single directory. This drastically reduces file system performance. IndiMail avoids this by injecting your email in a queue consisting of multiple directories and mails distributed as evenly as possible across these directories.

Balancing of emails across multiple queues is achieved by the program qmail-multi(8), which is actuall just a qmail-queue(8) replacement. Any qmail-queue frontend can use qmail-multi. The list of qmail-queue frontends in IndiMail are

1. sendmail
   
2. qmail-inject
   
3. qmail-smtpd
   
4. qmail-qmqpd
   
5. qmail-qmtpd
   
6. qreceipt
   
7. condredirect
   
8. dotforward
   
9. fastforward
   
10. forward
    
11. maildirserial
    
12. new-inject
    
13. ofmipd
    
14. replier
    
15. rrforward
    

You just need to configure the following environment variables to have the qmail-queue(8) frontends using qmail-multi(8)
1. QUEUE_BASE – Base directory where all queues will be placed
2. QUEUE_COUNT – number of queues
3. QUEUE_START – numeric prefix of the first queue
e.g. If you want IndiMail to use 10 queues, this is what you will do

% su
# for i in qmail-smtpd.25 qmail-smtpd.465 qmail-smtpd.587 qmail-send.25 \

> qmail-qmqpd.628 qmail-qmtpd.209

> do

> echo 10 > /service/$i/variables/QUEUE_COUNT

> echo “/var/indimail/queue” > /service/$i/variables/QUEUE_BASE

> echo “1” > /service/$i/variables/QUEUE_START

> done
#

You also need to make sure that you have ten queues in /var/indimail/queue.

% su

# for i 1 2 3 4 5 6 7 8 9 10

> do

> /usr/bin/queue-fix /var/indimail/queue/queue”$i” > /dev/null

> done

# exit

% ls -ld var/indimail/queue/queue*

drwxr-x---. 12 qmailq qmail 4096 Mar 30 2017 /var/indimail/queue/queue1

drwxr-x---. 12 qmailq qmail 4096 Dec 7 10:45 /var/indimail/queue/queue10

drwxr-x---. 12 qmailq qmail 4096 Mar 30 2017 /var/indimail/queue/queue2

drwxr-x---. 12 qmailq qmail 4096 Mar 30 2017 /var/indimail/queue/queue3

drwxr-x---. 12 qmailq qmail 4096 Mar 30 2017 /var/indimail/queue/queue4

drwxr-x---. 12 qmailq qmail 4096 Mar 30 2017 /var/indimail/queue/queue5

drwxr-x---. 12 qmailq qmail 4096 Dec 7 10:45 /var/indimail/queue/queue6

drwxr-x---. 12 qmailq qmail 4096 Dec 7 10:45 /var/indimail/queue/queue7

drwxr-x---. 12 qmailq qmail 4096 Dec 7 10:45 /var/indimail/queue/queue8

drwxr-x---. 12 qmailq qmail 4096 Dec 7 10:45 /var/indimail/queue/queue9

Now all you need is restart of all services to use the new QUEUE_BASE, QUEUE_COUNT, QUEUE_START environment variables

% sudo svc -d /service/qmail smtpd* /service/qmail-send.25 /service/qmail-qm?pd.*

% sudo svc -u /service/qmail smtpd* /service/qmail send.25 /service/qmail-qm?pd.*