Analysis of High Queue on Qmail Based Relay Server and its Resolution

Analysis of High Queue on Qmail Based Relay Server and its Resolution

Login at Qmail mail Relay server

qmHandle -s 
Total messages: 590
Messages with local recipients: 0
Messages with remote recipients: 590
Messages with bounces: 0
Messages in preprocess: 0

Check the Details of mails via

qmHandle -l | more 

Lot of mails having Subject "Undelivered Mail Returned to Sender"

562343 (16, 16/562343)
 Return-path: 
 From: MAILER-DAEMON@gateway-1.tetrain.com (Mail Delivery System)
 To: Enetadvicemailing@hdfcbank.com
 Subject: Undelivered Mail Returned to Sender
 Date: Thu, 20 Jun 2019 18:22:16 +0530 (IST)
 Size: 8475 bytes

So Now Run

vi /etc/inittab ; init q ; qmHandle -S'Undelivered Mail Returned to Sender' ; vi /etc/inittab ; init q

Comment With # on line

#SV:123456:respawn:/command/svscanboot

Save the file

It will delete all mails with mentioned subject and open the file once again .

Deleting message: 562609
Deleted 564 messages from queue
Qmail wasn't running when qmHandle was started, so it won't be restarted.

Now remove the comment on the same line and save it

SV:123456:respawn:/command/svscanboot

Depending On the Nature of Problem you can use the different options of qmHandle to Analyze the Issue and its Resolution .

Options are

[tetra@smtp-1 ~]$ qmHandle
qmHandle v1.3.2
Copyright 1998-2003 Michele Beltrame
Available parameters:
 -a       : try to send queued messages now (qmail must be running)
 -l       : list message queues
 -L       : list local message queue
 -R       : list remote message queue
 -s       : show some statistics
 -mN      : display message number N
 -dN      : delete message number N
 -fsender : delete message from sender
 -f're'   : delete message from senders matching regular expression re
 -Stext   : delete all messages that have/contain text as Subject
 -h're'   : delete all messages with headers matching regular expression re (case insensitive)
 -b're'   : delete all messages with body matching regular expression re (case insensitive)
 -H're'   : delete all messages with headers matching regular expression re (case sensitive)
 -B're'   : delete all messages with body matching regular expression re (case sensitive)
 -t're'   : flag messages with recipients in regular expression 're' for earlier retry (note: this lengthens the time message can stay  in queue)
 -D       : delete all messages in the queue (local and remote)
 -V       : print program version
Additional (optional) parameters:
 -c       : display colored output
 -N       : list message numbers only
          (to be used either with -l, -L or -R)
You can view/delete multiple message i.e. -d123 -v456 -d567