Txertatu erregela bat HTMLan
You can insert a horizontal line into the email (at the current position of the cursor) to help divide two sections:
Click Insert ▸ Rule… in the menubar.
Hautatu zabalera, tamaina eta lerrokatzea.
Select Shaded if wanted.
Egin klik Itxi aukeran.
Alternately, you can also use the icon in the second bar below the Subject line.