I would like to send emails via Pine (Alpine) but with correct style usage, for instance, underlining book names, etc. How can I create emails in Pine using underline, emphasis, etc. (This can include a variety of receivers of such emails ranging from other Pine users to Outlook to Gmail).
Pine/Alpine does not support composing messages in HTML (which is the only rich text format supported for email nowadays).
In plain-text media (IRC, non-HTML email), it is very common to use
Some mail readers even detect such markup and format text accordingly; an example is Thunderbird. This website does so too.