Compose fully-encoded mailto: links per RFC 6068 — add recipients, CC/BCC, subject, body, and even custom headers like In-Reply-To. Preview the rendered HTML link, copy the URI, or open it directly in your mail client.
Multiple recipients are comma-separated. The first recipient goes in the path; headers (cc,
bcc, subject, body) go in the query string and must be %xx-encoded.
Newlines in the body become %0D%0A. Not every mail client honors bcc — Gmail web ignores it.
Mobile mail apps usually handle the link well; desktop clients depend on OS default.