http://www.formatit.com/reformatit.html

default 50 characters

 

Limit Lines to 65 Characters Max

Notepad is very similar to your word processing
programs, except you have to hit enter to finish a
line and jump to the next line. This is important
because it allows you to control how many
characters appear on each line.

Properly formatted text emails are limited to 65
characters per line. You’ll notice when you
receive a text email there is typically a margin
of white space to the right of the copy. This
ensures that line breaks happen where you specify.

You don’t want the recipient’s email client to
determine where the lines wrap, or your email may
look sloppy.

At the end of each 65-character line, you need to
hit the enter or return key to break to the next
line. Notepad does not automatically wrap like
other word processing programs. Please stop my
friend