I only realized a month ago that Thunderbird got a "Filelink" feature to upload attachments to external service providers.
This article describes how it works: https://support.mozillamessaging.com/en-US/kb/filelink-large-attachments They provide Dropbox/YouSendIt providers, and of course I *had* to integrate DL so you can have your own "cloud" provider. So here it is: http://www.thregr.org/~wavexx/tmp/thunderbird-filelink-dl.xpi The integration is pretty sweet, and works by using the REST interface implemented in DL 0.10 and above. If you have a DL 0.10+ installation and you are using Thunderbird you can use it right away! It's going to be part of DL 0.11 (hopefully soon to be released). There are some caveats, mostly due to Thunderbird: I wasn't able to provide user-configurable settings in the management interface. Right now the extension will use the server's defaults. You also cannot have multiple DL services. Again, this is a Thunderbird limitation that prevents you to create multiple DL services. You cannot change the username once set. Again, the other extensions seem to have the same (dumb?) limitation. The password is not stored in the login manager (a bug out of lazyness, I will fix this later). If you convert an attachment to a link, and later "delete it", the ticket will *not* be deleted (but it will be expired normally). There's no REST interface for that yet. Likewise, there's no pretty pie chart in the management interface, because DL has no quotas yet. Feedback appreciated.