User Agent: Mozilla/5.0 (Windows NT 6.1; rv:7.0.1) Gecko/20100101 Firefox/7.0.1 Build ID: 20110928134238 Steps to reproduce: Just have receaved a common message with an attachment. Actual results: The attached file does not apear as so. Opening the source code of the email, the attach is there. Expected results: It should be shown when oppening the body email. Two of my user have complaind about this issue. Whem oppening the same email in our webmail it is shown normally. I tried installed an older version (like 6) and the issue is there as well. Just whem using the TB 3 (quite old), it worked fine. My server is IceWarp 10.3.4, but the issue was noticed still in version 10.2.x.

Confirmed on http://hg.mozilla.org/comm-central/rev/a83e6190537e Mozilla/5.0 (Windows NT 6.1; WOW64; rv:10.0a1) Gecko/20111027 Thunderbird/10.0a1 ID:20111027030258 http://hg.mozilla.org/releases/comm-aurora/rev/3d76059e165f Mozilla/5.0 (Windows NT 6.1; WOW64; rv:9.0a2) Gecko/20111026 Thunderbird/9.0a2 ID:20111026030018 http://hg.mozilla.org/releases/comm-beta/rev/6b638748ad35 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:8.0) Gecko/20111019 Thunderbird/8.0 ID:20111019101808 Regression window: Works: http://hg.mozilla.org/comm-central/rev/9524920e2c14 Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b7pre) Gecko/20101006 Thunderbird/3.3a1pre ID:20101006032808 Fails: http://hg.mozilla.org/comm-central/rev/afb7f32df77e Mozilla/5.0 (Windows NT 6.1; WOW64; rv:2.0b8pre) Gecko/20101007 Thunderbird/3.3a1pre ID:20101007035341 Pushlog: http://hg.mozilla.org/comm-central/pushloghtml?fromchange=9524920e2c14&tochange=afb7f32df77e Suspected: b731a64e2504 Jonathan Kamens — fix bug 351224, r=bienvenu, detach of grandchildren with mime multipart alternative

(In reply to Flavio from comment #0) > Just have receaved a common message with an attachment. > Actual results: > The attached file does not apear as so. Opening the source code of the email, the attach is there. >(snip) > Just whem using the TB 3 (quite old), it worked fine. (In reply to Alice0775 White from comment #1) > Suspected: > b731a64e2504 — fix bug 351224 What part in mail do you call by your "an attachment"? (a) non-referred and/or non-displayable part under multipart/related (b) image part under multipart/related which is correctly refered by cid: url in html (c) other As Suspected=fix bug 351224, if (a), dup of bug 674473, and if (b), dup of bug 602718.

I mean what follows the code: ################# Begin --b1_4ac6bb3ae505284748f85891a7389b33 Content-Type: application/octet-stream; name="SMN - CERTA.xls"; charset="UTF-8" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="SMN - CERTA.xls" ################# End If you try to open the .eml in mail clients they will show as an attached file (SMN - CERTA.xls). This file apears correctlly in much older versions of Thunderbird (3.x by example) and outlook, as an example. Just to make an extra comment: have just updated my client to TB version 8.0 and the issue persists.

This is same testcase as attachment 569948 [details], now in .zip format (more easily accesible than .rar). I didn't want to add .eml directly for privacy reasons.

TB12.0.1/WinXP Worksforme: Testcase of attachment 569948 [details] (rar), same as attachment 627120 [details] (zip) Both attached application/octet-stream (.xls) of test message are correctly shown in message reader as attachments (albeit of unknwon size), and open correctly.