This question is the second part of my previous question (https://support.mozilla.org/en-US/questions/989074 ). I use filelink feature of Thunderbird a lot for attaching big files. Everything thing works fine, however the email recipients keeps getting some tiny files attached with the email. These files are usually very small (few bytes) and are not related to the actual files attached in content. Also the number of these tiny files is always same as the number of file attached using filelink. See screenshots below. This has been a source of confusion among some of my co-workers. Is this intended behavior? If not, any idea what could be wrong with my setup? Screenshots: http://imgur.com/a/Cy8XA https://support.cdn.mozilla.net/media/uploads/images/2014-03-09-17-01-05-2f33c4.png https://support.cdn.mozilla.net/media/uploads/images/2014-03-09-17-01-10-34be95.png