EHLO
250-smtpcorp.com Hello dslb-088-077-003-169.pools.example.net [88.77.3.169]
250-SIZE 52428800
250-8BITMIME
250-PIPELINING
250-AUTH CRAM-MD5 PLAIN LOGIN
250-STARTTLS
250 HELP
AUTH LOGIN
334 VXNlcm5hbWU6
bm90bXl1c2VybmFtZQ==
334 UGFzc3dvcmQ6
bm90bXlwYXNzd29yZA==
235 Authentication succeeded
MAIL
FROM:<arduino@example.com>
250 OK
RCPT TO:<info@example.com>
250 Accepted <info@example.com>
DATA
354 Enter message, ending with "." on a line by itself
from:arduino@example.com
to:info@example.com
subject:This is a test
Really, it is a test!
.
250 OK id=1WrAQ9-4gfLuZ-5U
QUIT
221 smtpcorp.com closing connection
Connection closed by foreign host.
Although it’s more complex, this session is similar to our Daytime example.
We only send more complex commands. (By the way, you don’t have to write
the commands in uppercase.) Please note that we’re connecting to port 2525,
which is not the standard SMTP port (25). Check your SMTP service provider’s
website to see what port you have to use.
We start the session using
EHLO
. We use the
EHLO
command to tell the SMTP
server that we’d like to use a slightly extended version of SMTP that supports
authentication.
After that, we send the
AUTH LOGIN
command to tell the SMTP server that we’d
like to send our username and password. The SMTP server sends back the
string VXNlcm5hbWU6. It looks a bit weird at first, but it’s only the string
“Username:” encoded using Base64.
3
3.
http://en.wikipedia.org/wiki/Base64
At
http://www.freeformatter.com/base64-encoder.html
, you can convert
text into Base64 strings.
Chapter 11. Creating a Burglar Alarm with Email Notification • 186
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