Swift

Open a Persistent SMTP Connection

Demonstrates the Chilkat MailMan.OpenSmtpConnection method, which explicitly opens a connection to the SMTP server and authenticates if a username and password, OAuth2 token, or other applicable settings have been provided. This example opens the connection, notes where sending would occur, and closes it.

Background: By default, sending a single email opens a connection, sends, and closes it. When sending many messages, that per-message overhead adds up. Explicitly calling OpenSmtpConnection once, sending in a loop, then CloseSmtpConnection keeps a single authenticated session open for the whole batch — substantially faster and gentler on the server than reconnecting each time.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the MailMan.OpenSmtpConnection method, which explicitly opens a connection
    //  to the SMTP server and authenticates if credentials (or an OAuth2 token) have been
    //  provided.

    let mailman = CkoMailMan()!

    //  Configure the SMTP server connection.
    mailman.smtpHost = "smtp.example.com"
    mailman.smtpPort = 465
    mailman.smtpSsl = true
    mailman.smtpUsername = "user@example.com"
    mailman.smtpPassword = "myPassword"

    //  Explicitly open (and authenticate) the SMTP connection.

    success = mailman.openSmtpConnection()
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    print("SMTP connection opened.")

    //  ... send one or more emails here ...

    //  Close the connection when done.
    success = mailman.closeSmtpConnection()
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }


}