I have a lot of sections containing sometimes not much more than one or two lines. It's an edition of letters and i have no problem if a page is not filled to the last line. LaTeX tries to stretch the sections to the end of the page, giving the hole layout an uneven feeling. How can I set the penalties so that the processor prefers ending a page and starting a new one instead of stretching the lines between paragraphs?
I was looking for the command \raggedbottom, as Bernard mentionned in the comments.