Sample code for 30+ languages & platforms
Ruby

Read Gmail POP3 Mailbox

Reads the header for each email in a GMail POP3 mailbox and displays the FROM and SUBJECT header fields. In your GMail "Forwarding and POP" settings, be sure to select "When messages are accessed with POP keep Gmail's copy in the Inbox".

Chilkat Ruby Downloads

Ruby
require 'chilkat'

success = false

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

# The mailman object is used for receiving (POP3) 
# and sending (SMTP) email.
mailman = Chilkat::CkMailMan.new()

# Set the GMail account POP3 properties.
mailman.put_MailHost("pop.gmail.com")
mailman.put_PopUsername("myLogin")
mailman.put_PopPassword("myPassword")
mailman.put_PopSsl(true)
mailman.put_MailPort(995)

# Read mail headers and one line of the body.
# To get the full emails, set headersOnly = false
bundle = Chilkat::CkEmailBundle.new()
keepOnServer = true
headersOnly = true
numBodyLines = 1
success = mailman.FetchAll(keepOnServer,headersOnly,numBodyLines,bundle)
if (success == false)
    print mailman.lastErrorText() + "\n";
    exit
end

i = 0
email = Chilkat::CkEmail.new()
while i < bundle.get_MessageCount()
    bundle.EmailAt(i,email)

    # Display the From email address and the subject.
    print "From: " + email.ck_from() + "\n";
    print "Subject: " + email.subject() + "\n";

    i = i + 1
end