Swift

Close a Persistent SMTP Connection

Demonstrates the Chilkat MailMan.CloseSmtpConnection method, which explicitly closes the current SMTP connection. Before closing the socket, Chilkat sends the SMTP QUIT command so the server can end the session cleanly. This example opens a connection and then closes it.

Background: This is the companion to OpenSmtpConnection and completes the "open once, send many, close once" batch pattern. Sending QUIT before dropping the socket is proper SMTP etiquette: it tells the server you are finished so it can release resources gracefully rather than treating the disconnect as an abrupt drop.

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Swift


func chilkatTest() {
    var success: Bool = false

    //  Demonstrates the MailMan.CloseSmtpConnection method, which explicitly closes the current
    //  SMTP connection.  Before closing the socket, Chilkat sends the SMTP QUIT command.

    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"

    //  Open a connection (which would be reused for multiple sends).

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

    //  ... send emails here ...

    //  Explicitly close the SMTP connection (sends QUIT first).
    success = mailman.closeSmtpConnection()
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    print("SMTP connection closed.")

}