基本的にこっちとかわりません。
https://hacknote.jp/archives/1455/
openssl s_client -connect {host}:465 -crlf
ehlo localhost
auth plain なら
AUTH PLAIN {hashed}
auth login なら
AUTH LOGIN
{user_hashed}
{pass_hashed}
MAIL FROM: test@example.com RCPT TO: test@example.com DATA TEST TEST TEST .
