Shift+Enter for a normal new line. No idea why it's like this.

The default paragraph style has some margin.

- You can do Shift+Enter to get a `br` without breaking the paragraph. - You can change the format from "Paragraph" to "Body Text" to remove the margin. Note that Thunderbird changes new lines back to "Paragraph" automatically, so you need to frist write your email, then format it as "Body Text". - Or, you can disable the "Use Paragraph format instead of Body text by default" option in the settings, to always have "Body text".

	▲	Saris 3 hours ago \| parent [-]
		Good to know. I've always wondered why HTML editors tend to work this way (Wordpress is the same), instead of having a single enter key be a line break and a double enter key be a paragraph.

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F3nd0 4 hours ago | parent | prev [-]

If my understanding is correct, enter by default starts a new paragraph (<p>…</p> in HTML). Holding shift makes it add a line break (<br> in HTML).

I think maybe Thunderbird has a plain text mode where this doesn’t happen, but it’s been a while since I last used it, so I could be completely wrong.

	▲	thesuitonym 4 hours ago \| parent \| next [-]
		Thunderbird does have a plain text mode, and you set it to be the default. Nice thing about TB is that defaulting to plain text doesn't lock you into plain text like a lot of other editors out there--If you add any formatting it silently switches you to HTML email.
	▲	Saris 4 hours ago \| parent \| prev [-]
		Ah that would make sense I suppose as it's sending HTML by default. It does have a plain text mode!