Mail app bug with jumping to new line below signature

Question

Hi!
Since day one of using Lion i have this incredibly annoying bug with Mail application.
I have a formated signature in all my emails. Sometimes when I am composing a mail (or rather replying for one) and when I hit RETURN on keyboard, cursor moves BELOW signature and inserts new line below signature - not in place when it was when I hit RETURN.
The same is when I have cursor in middle of my message and hit enter. Nothing happens - text ater place when cursor was when I hit enter is staying where it was but cursor moves below signature and enters new line in there.
Anyone has solution for this?

Answer 1

Triple-click the word "telnet" in the line below on this page to select the whole line:
telnet imap.gmail.com 993
Copy the selected text to the Clipboard by pressing the key combination command-C.
Launch the built-in Terminal application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Terminal in the icon grid.
Paste into the Terminal window by pressing command-V. I've tested these instructions only with the Safari web browser. If you use another browser, you may have to press the return key after pasting.
You should almost instantly get three lines of output below what you entered, the last of which is this:
Escape character is '^]'.
If there's no output within ten seconds, consider that a failure. If you get something different from the above, please post it in a reply. You can then quit Terminal.