How to send large file attachments with Thunderbird?

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By default Thunderbird allows you to send attachments having a maximum size of 5MB. In order to send larger files, proceed as follows:

Method 1: Increase the max file size allowed

  • Open Thunderbird
  • Click on Tools > Options
  • Go to the Attachments tab > Outgoing
  • Check "Offer to share files larger than []MB
  • Set the value in MB

Method 2: Use an online cloud storage service


Link your Thunderbird mail client with a cloud storage service. No complex configuration required:
  • Open Thunderbird
  • Click on Tools > Options
  • Go to the Attachments tab > Outgoing
  • Click on the "Add" to create a filelink storage service.
  • Select a cloud storage service and click on the "Setup Account" button
  • A setup wizard shall open, simply follow the instructions:
Jean-François Pillou

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