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(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.

Chilkat .NET Downloads

Chilkat .NET Framework

Chilkat for .NET Core

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

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

bool success;

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

// Set the POP3 login/password.
mailman.PopUsername = "MY_LOGIN";
mailman.PopPassword = "MY_PASSWORD";

Chilkat.StringArray saUidls = null;

// The the UIDLs for all email in the POP3 mailbox.
saUidls = mailman.GetUidls();
if (mailman.LastMethodSuccess == false) {
    Debug.WriteLine(mailman.LastErrorText);
    return;
}

Chilkat.StringArray saMime = null;

// Download the email from the server.  Call FetchMultipleMime
// because we don't want to load the emails into email objects.
// (We'll delete the emails that are forwarded without error.)
// Note: It is not reasonable to call this method for a mailbox containing
// a huge number of emails.  For large mailboxes, it's better to download
// one by one and process each email independently. This way, if a 
// server or communications error occurs, it's possible to write code
// that can resume.
saMime = mailman.FetchMultipleMime(saUidls);

if (mailman.LastMethodSuccess == false) {

    Debug.WriteLine(mailman.LastErrorText);
    return;
}

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

int n = saMime.Count;

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

bool bAllOk = true;

int i = 0;
while (i < n) {

    string strMime = saMime.GetString(i);

    // Forward the email.
    success = mailman.SendMime(fromAddr,toAddr,strMime);
    if (success != true) {
        bAllOk = false;
        Debug.WriteLine(mailman.LastErrorText);
        // Force loop exit.
        i = n;
    }

    i = i + 1;
}

// Remove the emails in saUidls from the POP3 server.
if (bAllOk == true) {
    success = mailman.DeleteMultiple(saUidls);
    if (success != true) {
        Debug.WriteLine(mailman.LastErrorText);
    }

}

Debug.WriteLine("bAllOk = " + Convert.ToString(bAllOk));

 

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