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June 10th, 2015

​Cloud File Sharing in Postbox 4

Posted in: Tips, Add-ons

No one likes to wait for large email attachments to download. They can slow down your day and take up mailbox space.

A better solution is to send links to the files—shared from a cloud file service such as Dropbox, OneDrive, or Box—instead of the attachments themselves. This speeds up message sends, and enables message recipients to download only the files they want, when they want. Additionally, this method ensures that recipients are getting the latest and greatest version of your files, since they can be changed outside of email.

Postbox was one of the first email apps to provide built-in support for Dropbox file link sharing, and now we've upped the game by adding OneDrive and Box support in Postbox 4!

To share a link to a file, simply drag and drop the file from your cloud storage folder into the body of your message, and Postbox will automatically create the link. That's it.


Since these services are constantly being updated, we've moved our support for them to a free Postbox 4 add-on. This will help us respond quickly to any changes these service providers make going forward without having to update the entire Postbox 4 app.

Once you've subscribed to a cloud service via its own website, here's how to get it set up in Postbox 4.

Getting and Installing the Cloud File Sharing Add-on

Note: After you install the add-on, you need to restart Postbox, so if you're in the middle of anything, finish it up before proceeding.

  1. Visit Postbox's Add-ons page and download the Cloud File Sharing Add-on.
  2. Within Postbox, go to the Tools menu and select Add-ons.
  3. Click the gear icon in the upper right-hand corner of the window and select Install Add-on From File… from the popup menu.
  4. In the Select add-on to install window, locate the pb-cloud-file-share-[version number].xpi that you downloaded, select it, and click Open.
  5. The Add-ons Manager shows you the add-on and a reminder to be careful about whose add-ons you trust. But you can trust us. Click Install Now.
  6. Click the add-on's Restart button to enable the add-on.

Activating a Cloud Service

Once Postbox has restarted, you're ready to sign into any of the cloud services you want to use.

  1. Go to Preferences|Options > Attachments > Outgoing.
  2. Click Add at the bottom of the window, select the desired cloud service from the Select an online storage service popup, and click Set up Account.
  3. Enter your credentials for the selected service and sign in.
  4. If the service asks you to authorize access to your files and folder in Postbox, go ahead and do so.

When you're back in Postbox's Attachments pane, you'll see account information for your service.

You're good to go, so close the Attachments window.

Using Cloud File Sharing

  1. Create the email you in which you want to "send" the cloud file.
  2. Drag the file from your Dropbox, Box, or Microsoft OneDrive folder into the body of the email, and a link to the file will be created.
  3. Send the email.

Note: If you drag the file onto the email's attachment area, the file will be added to the email and sent as a standard attachment.