[Evolution] "TT" formatting in emails

["Neil McLeod" <neil a mcleod gmail com>]

Hi,

When I paste from an old email to compose a new one, I notice that the
"TT" button toggles as I move my cursor through the message, although
the button is grayed out. Does this have any effect on the formatting
of my email? If so, how can I get rid of it?

I was also wondering if Evolution is generally good with linebreaking,
so that the recipients of my messages do not get lines of uneven length.

Thank you!

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Ubuntu Linux 5.10 (Breezy Badger)
OpenOffice.org build 1.9.125.1
LyX 1.3.6
Evolution 2.4.1