In the mail compose window the shortcut keys in the file menu is always shows the same for "Ctrl+Return" and "Ctrl+Shift+Return" even in non-Mac OS. See https://bugzilla.mozilla.org/attachment.cgi?id=818268 in Bug 657852. this should be OS dependent. in Windows/Linux it should show "Ctrl+Enter" "Ctrl+Shift+Enter"
This should now be fixed by bug 106327. You can test in Thunderbird nightly, beta (59) or release of version 60.
Status: NEW → RESOLVED
Closed: Last year
Resolution: --- → DUPLICATE
Duplicate of bug: 106327
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