Hi Debbie,
Apologies, I was not sure which e-mail program you were using.
The second part about hitting enter and backspace as a fix to reset the font still applies.
If I am using big text I see how sometimes the first time I hit enter it changes back to the regular small text font.
When that happens if I hit backspace until I reach the last big text, hit enter, and then continue typing the text remains big on the second try.
Please let me know if this solution fixes the problem for you.
Thank you,
-Raymond