Emailing from the Command Line
Although email is an important service, only a few people know how it actually works behind the scenes. To send emails from an Arduino, we could choose the easy path and use a PC as an email relay, as we did in Tweeting Messages with Processing, to Tweet messages. As real hackers, we’ll follow a more sophisticated path and implement a subset of the Simple Mail Transfer Protocol (SMTP).[115]
SMTP is a typical Internet protocol. It uses only text, and it is mainly line-based; that is, you exchange information line by line. A typical email consists of only a few attributes: a sender, a receiver, a subject, and a message body. To transmit an email, you have to send a request to an SMTP server. The request has to ...
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