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Increasing the attachment size limit in Zimbra

While working with Zimbra, I figured out today that I needed to increase the attachment size limit of the message to send larger messages. The default attachment size limit is 10MB. Even if the attachment is a little less than 10MB, it won’t send quoting the same error that the maximum message size is crossing the limits. This is because of the fact that Zimbra will encode the message into base-64 encoding. With base64-encoding, the message size becomes larger than 10MB. So here is the command I used to increase the limit from 10MB to 20MB.

login:root
password:*****
[root@mail ~]# su zimbra
[zimbra@mail root]$ zmprov mcf zimbraMtaMaxMessageSize 20480000

20480000 is the message size in bytes. No need to restart Zimbra Server .. now you can send messages up to 20MB.

Note: Usually it is not advisable to increase the size of message to very large quantities as it will slow down the server performance.

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8 Responses

  1. thanks!
    this really helped me.

  2. Thanks,
    that was cool, and very helpful

  3. thanks a lot for you because i can increase upload file size .

  4. 100% working for increase upload file size..

    login:root
    password:*****
    [root@mail ~]# su zimbra
    [zimbra@mail root]$ zmprov mcf zimbraMtaMaxMessageSize 20480000

  5. thanks,
    can implemented to my email server, and i can send bigger attachment size.

  6. Hi!
    My problem is a little diferente.. I need to increase the attachment size limit of the receive messages.

    Users (of my Zimbra Collaboration Suite 6.0) have problems for receive mails with attachments upper to 8Mb! The emails are rejected on the sender.

    Which config file or parameter I have to change on Zimbra Server related with the receive messages size limit?

    thanks!!

  7. Worked like a charm, however I need set size limits of attachments on a user level. E.g account and all can send rec. messages of normal size(glogal setting) design team (single account) can send attachment of large size eg 20Mb

  8. great! it works fine

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