We had the "nl2br" filter applied for Markdwon text, which caused every

newline to have a <br/>. However, these appeared inside a <pre/>, and we

still had newlines. The end result was that we had a blank line for

every line of text.
I can't see any reason why we'd need this filter, so I've removed it.

This results in proper-looking e-mails.

Previewed some e-mails, which looked correct instead of having blank lines

everywhere.