What are the Curl SMTP command line arguments to support GMail TLS/STARTTLS vs SSL

What are the Curl SMTP command line arguments to support GMail TLS/STARTTLS vs SSL

email ssl curl command-line smtp

curl

CURL Sendmail via bash

bash email curl smtp

curl

Sending email with VMIME/libcurl not through a server (or: SMTP server library)

c++ c email curl smtp

curl

Sending feedback data via HTTPS POST from wxWidgets application

http ssl curl smtp wxwidgets

curl

cURL and SMTP error after SSL and clodflare

ssl curl nginx smtp cloudflare

curl