C#

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. C#

bool success = false;

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

Chilkat.MailMan mailman = new Chilkat.MailMan();

//  Set the POP3 server's hostname
mailman.MailHost = "pop.example.com";

//  Set the POP3 login/password.
mailman.PopUsername = "MY_POP3_LOGIN";
mailman.PopPassword = "MY_POP3_PASSWORD";

//  Set the SMTP hostname for sending.
mailman.SmtpHost = "smtp.example.com";
mailman.SmtpUsername = "MY_SMTP_LOGIN";
mailman.SmtpPassword = "MY_SMTP_PASSWORD";

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

//  The the UIDLs for all email in the POP3 mailbox.
Chilkat.StringTable stUidls = new Chilkat.StringTable();
success = mailman.FetchUidls(stUidls);
if (success == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

//  Just mark messages for delete, then delete at the end.
mailman.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.)
Chilkat.BinData bdMime = new Chilkat.BinData();

int count = stUidls.Count;
int i = 0;
while (i < count) {
    string uidl = stUidls.StringAt(i);
    Debug.WriteLine("UIDL: " + uidl);

    success = mailman.FetchMimeBd(uidl,bdMime);
    if (success == false) {
        Debug.WriteLine(mailman.LastErrorText);
        return;
    }

    success = mailman.SendMimeBd(fromAddr,toAddr,bdMime);
    if (success == false) {
        Debug.WriteLine(mailman.LastErrorText);
        return;
    }

    success = mailman.DeleteByUidl(uidl);
    if (success == false) {
        Debug.WriteLine(mailman.LastErrorText);
        return;
    }

    i = i + 1;
}

//  Delete messages marked for delete.
mailman.ImmediateDelete = true;
success = mailman.Pop3EndSession();
if (success == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Debug.WriteLine("Success.");