(Go) Send Email to Distribution List

Sends the same email to a list of 1000 email addresses in 50 sends where each email has 20 recipients.

Note: Chilkat is not intended nor designed for mass emailing. A solution such as this might be used for a corporate emailing to employees, or an emailing to newsletter subscribers.

Chilkat Go Downloads Go Package for Windows, MacOS, Linux, Alpine Linux, Solaris

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

    mailman := chilkat.NewMailMan()
    var success bool

    mailman.SetSmtpHost("smtp.mymailserver.com")
    mailman.SetSmtpPort(465)
    mailman.SetSmtpSsl(true)
    mailman.SetSmtpUsername("myUsername")
    mailman.SetSmtpPassword("myPassword")

    // Create a new email object
    email := chilkat.NewEmail()
    email.SetSubject("This is a test")
    email.SetBody("This is a test")
    email.SetFrom("Senders Name <sender@example.com>")
    email.AddTo("Subscribers","subscribers@example.com")

    bdMime := chilkat.NewBinData()
    mailman.RenderToMimeBd(email,bdMime)

    // Load a file containing one email address per line.
    distList := chilkat.NewStringTable()
    success = distList.AppendFromFile(1000,"utf-8","qa_data/distList.txt")
    if success == false {
        fmt.Println(distList.LastErrorText())
        mailman.DisposeMailMan()
        email.DisposeEmail()
        bdMime.DisposeBinData()
        distList.DisposeStringTable()
        return
    }

    sbRecipients := chilkat.NewStringBuilder()

    i := 0
    szDistList := distList.Count()
    j := 0
    for i < szDistList {

        // Build a list of comma-separated recipients.
        if j > 0 {
            sbRecipients.Append(",")
        }

        sbRecipients.Append(*distList.StringAt(i))

        i = i + 1
        j = j + 1

        // If we have 20 recipients, or we have the final recipient in the final chunk, then send.
        if (j == 20) || (i == szDistList) {
            success = mailman.SendMimeBd("sender@example.com",*sbRecipients.GetAsString(),bdMime)
            if success != true {
                fmt.Println(mailman.LastErrorText())
                mailman.DisposeMailMan()
                email.DisposeEmail()
                bdMime.DisposeBinData()
                distList.DisposeStringTable()
                sbRecipients.DisposeStringBuilder()
                return
            }

            j = 0
            sbRecipients.Clear()
        }

    }

    success = mailman.CloseSmtpConnection()
    if success != true {
        fmt.Println("Connection to SMTP server not closed cleanly.")
    }

    fmt.Println("Email sent to distirbution list.")

    mailman.DisposeMailMan()
    email.DisposeEmail()
    bdMime.DisposeBinData()
    distList.DisposeStringTable()
    sbRecipients.DisposeStringBuilder()