As I have mentioned in previous posts, I am taking a few Computer Science courses at Cuesta College. For these courses it is necessary to email source code to the instructor as part of turning in assignments.
I switched to using Mozilla Thunderbird several months ago and have been very satisfied with it. However, upon submitting a few of the above mentioned assignments my instructor told me that I needed to get a different account or "credit will prove elusive." That is when I discovered one "feature" of Thunderbird that is particularly annoying and a little tedious to turn off.
After thoroughly going over all the GUI options in Thunderbird 1.0.7 I began Googleing for the answer. I found this as the fruits of my labor managed eventually to turn of the "feature." What is the "feature" I keep mentioning? Sending out emails with attachments Thunderbird graciously place all plain text attachements in the body of the email for you. So when multiple source code files are sent, all files are displayed in a row as the message of the email.
Now you too can turn this "feature" off and continue to use Thunderbird quite happily.