# exim -bP | grep message_size_limit
 message_size_limit = 50M

You can change maximum message size by adding line

message_size_limit = 5M

on the first textarea of the Advanced Mode editor in WHM > Exim Configuration Editor. That will put a 5MB message size limit on email.

PS: the limit only affect is email is sent directly using Email Client, if using Webmail (Squirrelmail) there is another limitation set by PHP when uploading file. it’s variable upload_max_filesize, you can change the value on WHM >  PHP Configuration Editor. Restart apache to make sure variable.

Info from cPanel Forum

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qmHandle is a simple program which allows you to view and manage the qmail message queue.

The key features of qmHandle are:

• Freeware and open source, under the GNU General Public License;
• More information provided when reading queue contents compared to qmail-qread
• You can print queue statistics, like qmail-qstat, with color capabilities;
• You can view a message in the queue;
• You can remove one or more messages from the queue based on a criterion or use multiple delete requests each having its own criterion;
• Written in Perl, and therefore easily customizable and truly multiplatform.

The software will work on every Unix platform with Perl installed and qmail installed.

qmHandle can be downloaded qmHandle project homepage

For me qmHandle is a great tool and a must have for sysadmin for managing qmail queue system. Enough for explanation. Now let’s get started how to use it.

Help and Options

# qmHandle --help
qmHandle v1.2.0-bovine
Copyright 1998-2003 Michele Beltrame
Patched 2004-2006 Robert McLeay

Available parameters:
  -V     : print program version
  -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
  -Stext : delete all messages that have/contain text as Subject
  -D     : delete all messages in the queue (local and remote)
  -tX 'string': delete all messages with matching headers, where 'string' is the
                string to match and X specifies:
                  'f'  : Who the message is from,
                  't'  : Who the message is to; or,
                  's'  : What the message's subject is
  -M          : delete all msgs in the queue from
                MAILER-DAEMON@svr-m1.rpxholding.com
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 -m456 -d567

Before you run qmHandle to manage your queue, make sure qmail already stop just to make sure no corruption will happen, except for option -a

Listing and displaying message in queue

# qmHandle -l | more
16923 (18, R)
 Return-path: ipamudji@yourcompany.com
 From: "imi" <ipamudji@mycompany.com>
 To: "Sumarna" <hsumarna@mycompany.com>
 Subject: Malaysia Sdn Bhd
 Date: Fri, 15 Jan 2010 18:07:59 +0700
 Size: 64774 bytes

16946 (18, R)
 Return-path: ipamudji@yourcompany.com
 From: "imi" <ipamudji@yourcompany.com>
 To: "Yogi" <yogi@mycompany.com>
 Cc: <pdewi@mycompany.com>
 Subject: Fw: Critical Urgent
 Date: Fri, 15 Jan 2010 18:07:59 +0700
 Size: 64590 bytes

The first line 16923 (18, R) shows us the message ID (16923), and queue type (Remote or Local) in this case both of them are remote queue, which mean this message are sent from other mailserver. The rest of lines is header information for you to tell from where, to where, when, what subject and message size.

you can use -L or -R option to list message queue only from Local or from Remote

# qmHandle -L
Messages in local queue: 0
Messages in remote queue: 4

# qmHandle -R | more
16946 (18, R)
 Return-path: ipamudji@yourcompany.com
 From: "imi" <ipamudji@yourcompany.com>
 To: "Yogi" <yogi@mycompany.com>
 Cc: <pdewi@mycompany.com>
 Subject: Fw: Critical Urgent
 Date: Fri, 15 Jan 2010 18:07:59 +0700
 Size: 64590 bytes

Now to see the body of message use -m option followed by message id

# qmHandle -m16197 | more

 --------------
MESSAGE NUMBER 16197
 --------------
Received: (qmail 10236 invoked by uid 89); 15 Jan 2010 11:35:41 -0000
Received: by simscan 1.3.1 ppid: 10226, pid: 10230, t: 0.7821s
         scanners: attach: 1.3.1 clamav: 0.95.2/m:51
Received: from unknown (HELO nurhalimah) (snurhalimah@10.10.14.53)
  by svr-m1.mycompany.com with ESMTPA; 15 Jan 2010 11:35:41 -0000
Message-ID: <057a01ca95d7$09397c30$350e0a0a@nurhalimah>
From: "Nur Halimah"
To: ,
Subject: Pls ...need help
Date: Fri, 15 Jan 2010 18:36:52 +0700
MIME-Version: 1.0
Content-Type: multipart/alternative;
        boundary="----=_NextPart_000_0577_01CA9611.B4BF5950"

Dear team,=20

Mohon bantuannya, makasih

To display statistic only for local and remote queue, use

# qmHandle -s
Messages in local queue: 0
Messages in remote queue: 4

Send queued messages

If message failed to sent, they will be in queue for re-trying until it past queue life time.  You can try to send all queued messages by running

# qmHandle -a

Delete queued message

Okay now we came into our important section, before you use one of these options make sure qmail has stop to prevent corruption in queue message.

Delete 1 message, use -d option followed by message id

# qmHandle -d16197

Delete all messages

# qmHandle -D

Delete all queue messages with Subject containing “REPORT 14 JANUARY 2010″, remember Reply and Forward messages also will be deleted because the Subject is “Re: REPORT 14 JANUARY 2010″ or “Fwd: REPORT 14 JANUARY 2010″

# qmHandle -S"REPORT 14 JANUARY 2010"

Delete All messages, use it with precaution and make sure this is the right choice

# qmHandle -D

That’s all folks, now you know what to do with your queue system, just in case you sent the wrong email.

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