Ruby

SMTP Inspection

See more SMTP Examples

Examine an SMTP session to view all communications sent to the SMTP server. Ruby

require 'chilkat'

success = false

mailman = Chilkat::CkMailMan.new()

mailman.put_SmtpHost("smtp.example.com")
mailman.put_SmtpUsername("myUsername")
mailman.put_SmtpPassword("myPassword")

mailman.put_SmtpPort(465)
mailman.put_StartTLS(true)

email = Chilkat::CkEmail.new()

email.put_Subject("This is a test")
email.put_Body("This is a test")
email.put_From("Alex <alex@example.com>")
email.AddTo("Christoph","christoph@example2.com")
email.AddBcc("Victor","victor@example3.com")

# Generate the MIME that is sent when SendEmail is called
mimeStr = mailman.renderToMime(email)
print mimeStr + "\n";

success = mailman.SendEmail(email)
if (success == false)
    print mailman.lastErrorText() + "\n";
    exit
end

success = mailman.CloseSmtpConnection()
if (success != true)
    print "Connection to SMTP server not closed cleanly." + "\n";
end

# Examine the SMTP session log.
print "----" + "\n";
print "Smtp Session Log:" + "\n";
print mailman.smtpSessionLog() + "\n";

# ---------------------------------------------------
# Sample output:
# ---------------------------------------------------

# MIME-Version: 1.0
# Date: Fri, 06 Mar 2026 16:21:00 -0600
# Message-ID: <A5DC25990C93EC2676F4FBB2BB3BFA9EB34FF9D3@CHILKAT25>
# Content-Type: text/plain; charset=us-ascii; format=flowed
# Content-Transfer-Encoding: 7bit
# X-Priority: 3 (Normal)
# Subject: This is a test
# From: Alex <alex@example.com>
# To: Christoph <christoph@example2.com>
# Bcc: Victor <victor@example3.com>
# 
# This is a test
# ----
# Smtp Session Log:
# 220 smtp.example.com ESMTP Amazon WorkMail SMTP Service
# EHLO MYCOMPUTER<CRLF>
# 250-smtp.example.com
# 250-8BITMIME
# 250-AUTH PLAIN LOGIN
# 250 Ok
# AUTH LOGIN<CRLF>
# 334 VXNlcm5hbWU6
# YWRtaW5AY2hpbGthdHNvZnQuY29t<CRLF>
# 334 UGFzc3dvcmQ6
# {PasswordOrCredentials}
# 235 Authentication successful.
# MAIL FROM:<alex@example.com><CRLF>
# 250 Ok
# RCPT TO:<christoph@example2.com><CRLF>
# 250 Ok
# RCPT TO:<victor@example3.com><CRLF>
# 250 Ok
# DATA<CRLF>
# 354 End data with <CR><LF>.<CR><LF>
# {388 bytes} <--- The MIME source of the email (examined via RenderToMime) was sent here.
# <CRLF>.<CRLF>
# 250 Ok
# QUIT<CRLF>
# 221 Bye