If I draft an email message in emacs and then cut-and-paste it to the gmail web app, the text looks fine. Only plain text gets copied.
But if I use iOS Notes to draft the message on an iPhone (what else do you use to draft?) and then cut-and-paste the message to the gmail iOS app (you agree it's more convenient then using the gmail web app on an iPhone, no?), then some kind of rich-text gets copied, with the result of sending text in a much larger font.
How do I cut-and-paste plain text from Notes to another iOS app?