User Agent: Mozilla/5.0 (X11; Linux i686; rv:38.0) Gecko/20100101 Thunderbird/38.1.0 Build ID: 2015070700 Steps to reproduce: 1. Start composing a new mail (plain text) 2. Paste text which contains newlines 3. Send message In the composing window, the text looks fine, i.e.: foo bar qux Once sent however, all pasted newlines are doubled: foo bar qux The doubled newlines also show up when the mail is in the "Sent" or "Drafts" directory. This bug appears after the upgrade to 38.1.0. It is not present in previously installed version 31.7.0 (2015050800) Looking at the release notes, it might be associated with the fix of bug 1143570
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