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How to set maximum email size in Plesk for a VPS

Difficulty: Intermediate


  • VPS administrator login details to Plesk


The following support article demonstrates how to set the message size of emails for a VPS. This is the limit set for both incoming and outgoing emails to the server.

Please be aware that many other email servers have fixed size limits and the changing of this value may not fix your problem.

Conetix highly recommends using an alternative to email for sending large files to avoid issues.


  1. Once logged into Plesk, from the “Server Management” tab on the left, click on “Tools & Settings”.
    Email maximum email size - Tools and Settings
  2. Under “Mail” click on “Mail Server Settings”.
    vps email maximum size
  3. In the field for “Maximum message size” enter the value (in kilobytes) you require.
    vps maximum email size

    Hint: 20MB = 20480KB, 50MB = 51200KB

  4. Click “OK”.

You can now send emails up to the maximum message size.

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