Xbase++

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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LOCAL nSuccess
LOCAL oMailman

nSuccess := 0

//  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.

oMailman := CreateObject("Chilkat.MailMan")

//  Configure the SMTP server connection.
oMailman:SmtpHost := "smtp.example.com"
oMailman:SmtpPort := 465
oMailman:SmtpSsl := 1
oMailman:SmtpUsername := "user@example.com"
oMailman:SmtpPassword := "myPassword"

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

nSuccess := oMailman:OpenSmtpConnection()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    RETURN
ENDIF

? "SMTP connection opened."

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

//  Close the connection when done.
nSuccess := oMailman:CloseSmtpConnection()
IF (nSuccess == 0)
    ? oMailman:LastErrorText
    oMailman:destroy()
    RETURN
ENDIF

oMailman:destroy()