It can take a little care to quote source text in a way that is readable and useful.  Many mail tools will end up squashing out white space, which destroys indentation and makes the program much harder to read. If you're posting via e-mail, use your mail program's "preformatted" or "fixed width" features.  In Thunderbird, that's a pull-down at the left side of the composition toolbar.  Alternatively, send the message in plain text mode. If you're posting via the web interface, use the "Type" pulldown and select "Code".  To get back to ordinary text, use Shift+Enter.  (You might think that you could just select Plain, but that will change the stuff you just typed.)  You might think that you could use the <> button, but it doesn't protect indentation. Don't send pictures of programs, unless you are trying to demonstrate an editor user interface problem.  Readers can't copy the text from a picture and experiment with it.