Lianja

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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llSuccess = .F.

//  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.

loMailman = createobject("CkMailMan")

//  Configure the SMTP server connection.
loMailman.SmtpHost = "smtp.example.com"
loMailman.SmtpPort = 465
loMailman.SmtpSsl = .T.
loMailman.SmtpUsername = "user@example.com"
loMailman.SmtpPassword = "myPassword"

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

llSuccess = loMailman.OpenSmtpConnection()
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loMailman
    return
endif

? "SMTP connection opened."

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

//  Close the connection when done.
llSuccess = loMailman.CloseSmtpConnection()
if (llSuccess = .F.) then
    ? loMailman.LastErrorText
    release loMailman
    return
endif



release loMailman