Email Signatures not formatting correctly

It seems that the problem is part of TinyMCE.

It affects the whole body of a plaintext email, not only the signature!

The solution seems to be:

As of version 3.0a1, forced_root_block is enabled by default. The documentation also saysthat if you disable this option, Enter will produce a <br />, while Shift+Enter will produce a <p>.

Try this:

tinyMCE.init({
    mode : "textareas",
    theme : "simple",
    forced_root_block : false,
});

Any idea where to find this? Would be good if forced_root_block was disabled by default.

Thanks