How to Adjust the Zimbra Maximum Message and Upload Size via CLI

This article show you how to check and adjust the maximum message size and upload size to an email via the Zimbra MTA (Postfix). The default Postfix message_size_limit was 10MB (10240000 bytes) and the message_size_limit postconf parameter is configured globally for all zimbra MTAs.

Q. How to Adjust the Zimbra Maximum Message and Upload Size via command line interface (CLI) ?

A. This is how to check and adjust the Maximum Message Size and upload size. All the below command shall be runa s zimbra user :

See also  How to Prepare for Zimbra Collaboration Suite 8.0.2 Mail Server Installation on CentOS 6.4 x86_64

zimbraMtaMaxMessageSize = Refer to message size of the email.
zimbraFileUploadMaxSize = refer to file uploads include attachments to messages, appointments, tasks and etc.
zimbraMailContentMaxSize = Refer to the overall message size
ms = modifyServer
mcf = modifyConfig
gcf = getConfig

1. Run as zimbra user :

# su - zimbra

2. Check the default message_size_limit parameter :

$ postconf | grep message_size_limit

Example and Result:

$ postconf | grep message_size_limit
message_size_limit = 10240000

3. Check the default global size for zimbraMtaMaxMessageSize, zimbraFileUploadMaxSize and zimbraMailContentMaxSize :

$ zmprov gcf zimbraMtaMaxMessageSize
zimbraMtaMaxMessageSize: 10240000
$ zmprov gcf zimbraFileUploadMaxSize
zimbraFileUploadMaxSize: 10240000
$ zmprov gcf zimbraMailContentMaxSize
zimbraMailContentMaxSize: 10240000

4. Change zimbraMtaMaxMessageSize and zimbraFileUploadMaxSizeto 40MB (40960000 bytes) globally.

$ zmprov modifyConfig zimbraMtaMaxMessageSize 40960000
$ zmprov modifyConfig zimbraFileUploadMaxSize 40960000

5. Usually overall message size will be bigger because each message may consist multiple upload files or attachment. In this case we will configure zimbraMailContentMaxSize parameter to 100MB :

$ zmprov modifyConfig zimbraMailContentMaxSize 102400000

6. Check the result of above command :

$ postconf | grep message_size_limit
message_size_limit = 40960000

7. How to set the Maximum Message and Upload Size to 40MB per server and overall message size to 100MB per server :

$ zmprov ms `zmhostname` zimbraFileUploadMaxSize 40960000
$ zmprov ms `zmhostname` zimbraMtaMaxMessageSize 40960000
$ zmprov ms `zmhostname` zimbraMailContentMaxSize 102400000

or

$ zmprov modifyServer mail1.ehowstuff.local zimbraFileUploadMaxSize 40960000
$ zmprov modifyServer mail1.ehowstuff.local zimbraMtaMaxMessageSize 40960000
$ zmprov modifyServer mail1.ehowstuff.local zimbraMailContentMaxSize 102400000

7. In most of the cases, all of above command will take effect automatically. But if the change does not happen after a short period of time, most likely we will need to do postfix reload or full zmcontrol restart :

$ postfix reload
$ zmcontrol restart

Note : Server settings override global setting

How to Reset the Directory Manager Password on RHEL 7 / CentOS 7
How to Reset the Directory Manager Password on RHEL 7 / CentOS 7

It is best practice to remember passwords, but because too many passwords, sometimes we forget. We are not encouraged to write the password on any paper or share the password...

How to Find Big Files Size on Linux RHEL/CentOS
How to Find Big Files Size on Linux RHEL/CentOS

As the linux administrator, sometimes we have to identify which files are most take much space in the linux server resulting in low free space. Low disk space can also...

Why Linux users should worry about malware and what they can do about it
Why Linux users should worry about malware and what they can do about it

Don’t drop your guard just because you’re running Linux. Preventing the spread of malware and/or dealing with the consequences of infection are a fact of life when using computers. If...

How to Reset Forgotten Root Password on Linux RHEL 7 / CentOS 7
How to Reset Forgotten Root Password on Linux RHEL 7 / CentOS 7

This short howto will explain the steps to reset a lost root password or to reset a forgotten root password on Linux RHEL 7 or CentOS 7. Basically, we will...

How to Update CentOS or Upgrade CentOS to the Latest Version
How to Update CentOS or Upgrade CentOS to the Latest Version

Recently, the latest version of CentOS 7.3 was released. All users of CentOS 7.0, 7.1 and 7.2 can upgrade their system to the most recent. This quick guide will explain...

How to Change your WordPress Username, Nickname and Display Name in MySQL
How to Change your WordPress Username, Nickname and Display Name in MySQL

After you create an account log in WordPress, you may want to change your WordPress username, as appropriate or due to security reason. However, you can not do this from...

How to Enable SSH Root Login on Ubuntu 16.04
How to Enable SSH Root Login on Ubuntu 16.04

As what we wrote in the previous article on how to allow SSH root on Ubuntu 14.04, after installing a fresh new copy of Ubuntu 16.04 LTS, we find that...

How to Change UUID of Linux Partition on CentOS 7
How to Change UUID of Linux Partition on CentOS 7

UUID (Universally Unique IDentifier) should be unique and it is used to identify storage devices on a linux system. If you cloned a virtual machine from vCenter, the metadata containing...

1 Comment

Leave a Reply

Your email address will not be published. Required fields are marked *