Re:Ask HN: What's the best tool you used to use that doesn't...
by jeremysmyth on Sunday May 15, 2016 @06:32AM
(#11700320)
HTML ignores line breaks. If you're using plain text, the format=flowed header is what ignores line breaks. Not all clients support it.
Outlook seems to just ignore line breaks by default. But, there is probably a mime type to get around that.