Created attachment 8702102 [details] Test Mail with PNG pictures as attachments Steps how to reproduce with SeaMonkey German 2.39 final Mozilla/5.0 (Windows NT 6.1; WOW64; rv:42.0 from official download area) Gecko/20100101 Firefox/42.0 Build 20151103191810 (Classic Theme) on German WIN7 64bit 0. Import and open attached email (what will be difficult because of Bug 684924) or create a new one with 3 simple small pictures as attachments 2. Send that email to an own email account 3. Click received mail in Thread Pane 4. In Mail View Pane / attachments list pane in grey mail header view select all 3 attachments, 'rightlick attachments → Detach → confirm warning and save' » All selected files will be saved as expected Expected: no longer attachments shown Actual: all 3 file names will remain in attachments list pane Additional Tests 5. In received mail open picture attachments by double click: » Pictures will be opened in Browser and show expected pictures 6. Compare email source text of sent mail and received mail: » Sent mail will contain 3 binary blocks for pictures » Received mail will contain 3 hints that attachment has been 7. 'Rightclick received mail in Inbox Thread Pane → Edit as New → » Attachments list pane still will show 3 .png files, but with unexpected small file sizes » double click on attachment will try to open a picture in browser, but fails with error message. Mail Source examination in a saved draft copy will show that binary blocks for pictures are much smaller than in Step 6 sent mail source. Additional information a) Possibly similar roots like b) I did not find a clear DUP in <https://bugzilla.mozilla.org/buglist.cgi?cmdtype=dorem&remaction=run&namedcmd=DUPs1235208&sharer_id=41036> c) Probably rather old bug, I will do tests where this started, soon.
c): Already REPRODUCIBLE with EN-US SeaMonkey 2.10 Gecko/20100101, Classic Theme, on German WIN7 64bit d) All the same with Thunderbird 45.0a1 (2015-12-09)
Version: SeaMonkey 2.39 Branch → SeaMonkey 2.10 Branch
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