(Ruby) POP3 to SMTP Forwarder

Read a POP3 mailbox and forwards the email to another email address, keeping the recipients in the original email the same.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat Ruby Downloads install from rubygems.org gem install chilkat or download... Ruby Library for Windows, MacOS, Linux, Alpine Linux

require 'chilkat'

success = false

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

mailman = Chilkat::CkMailMan.new()

# Set the POP3 server's hostname
mailman.put_MailHost("pop.example.com")

# Set the POP3 login/password.
mailman.put_PopUsername("MY_POP3_LOGIN")
mailman.put_PopPassword("MY_POP3_PASSWORD")

# Set the SMTP hostname for sending.
mailman.put_SmtpHost("smtp.example.com")
mailman.put_SmtpUsername("MY_SMTP_LOGIN")
mailman.put_SmtpPassword("MY_SMTP_PASSWORD")

fromAddr = "me@example.com"
toAddr = "recipient@somewhere.com"

# The the UIDLs for all email in the POP3 mailbox.
stUidls = Chilkat::CkStringTable.new()
success = mailman.FetchUidls(stUidls)
if (success == false)
    print mailman.lastErrorText() + "\n";
    exit
end

# Just mark messages for delete, then delete at the end.
mailman.put_ImmediateDelete(false)

# Download the email from the server.  Call FetchMimeBd
# because we don't want to load the emails into email objects.
# (We'll delete the emails that are forwarded without error.)
bdMime = Chilkat::CkBinData.new()

count = stUidls.get_Count()
i = 0
while i < count
    uidl = stUidls.stringAt(i)
    print "UIDL: " + uidl + "\n";

    success = mailman.FetchMimeBd(uidl,bdMime)
    if (success == false)
        print mailman.lastErrorText() + "\n";
        exit
    end

    success = mailman.SendMimeBd(fromAddr,toAddr,bdMime)
    if (success == false)
        print mailman.lastErrorText() + "\n";
        exit
    end

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

    i = i + 1
end

# Delete messages marked for delete.
mailman.put_ImmediateDelete(true)
success = mailman.Pop3EndSession()
if (success == false)
    print mailman.lastErrorText() + "\n";
    exit
end

print "Success." + "\n";