Enable duplicate deliveries

Since we started FastMail, our email server has used a system called “duplicate delivery suppression” to avoid mail loops.

Basically every email generated has a unique identifier in it’s header called the Message-Id. When an email is delivered to your account, we check if an email with the same Message-Id has already been delivered to the same folder and if so, we discard the message. This avoids an infinite loop problem if you accidentally setup forwarding between two systems to forward between each other.

Some people manage their email in a way this can cause problems however (eg cc themselves on a mailing list post, then they end up with a copy, and the copy being returned from the mailing list system is suppressed)

On the beta server at http://www.fastmail.fm/beta/, there’s no an extra per-folder option on the Options -> Folders screen that allows you to turn of duplicate delivery suppression on a per folder basis. In the vast majority of cases we recommend that people do NOT change this setting (one day you’ll accidentally setup an forwarding infinite loop and use up all your storage and bandwidth), but for those that do need it, it is now possible.

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Create website with file upload ability

The Files screen has allowed you to easily create Websites to share files with other people, including a photo gallery option to instantly turn a directory full of pictures into a easy to use and powerful photo gallery (example).

One thing that hasn’t been possible though is to allow other people to upload files to a directory. That’s now possible with the new Publish as “Files & Dir listing with upload” on the Websites screen. When you publish a directory in this mode, it displays the usual list of files in the directory, but also includes an area at the bottom to allow people to upload a file.

If you use this feature, there are currently a number of limitations you should be aware of:

  1. There’s no way to limit the amount or size of files people can upload. People will be able to upload files until your file storage area reaches it’s quota
  2. You can however password protect the website so that only people you give the password to will be able to upload
  3. Existing files in the directory cannot be deleted or overwritten, only new files can be uploaded
  4. You can allow uploads into a photo gallery by publishing the directory as two separate URLs. For instance you might publish a directory as a “Photo gallery” with no password to the URL http://photos.yourusername.fastmail.fm so everyone can see it, but also publish the same directory as a “Files & Dir listing with upload” to the URL http://upload.yourusername.fastmail.fm, which you might also password protect to limit who can upload photos
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