Computer Networks -email

Question

How will you send an e-mail to someone when you have neither the recipient's e-mail address nor the e-mail application.

Comments

You dont need any application as you can directly use SMTP protocol and connect to a SMTP server and send email. But you cannot send an email without a recipient email -- spams are sent by collecting email addresses from some source.

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So will have to use SMTP commands like HELO, MAIL,RCPT? I'm not sure how to implement this thing.

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I think when we use send mails funtions in programming launguges like in node,php,java or any backend launguage we use smtp server.we dont have application for send a mail still we send it,i did it using node js it’s easy you can also try.but recipent address should must 

ex : https://stackoverflow.com/questions/14456673/sending-email-with-php-from-an-smtp-server