Visual FoxPro

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 lnSuccess
LOCAL loMailman

lnSuccess = 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.

loMailman = CreateObject('Chilkat.MailMan')

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

*  Explicitly open (and authenticate) the SMTP connection.

lnSuccess = loMailman.OpenSmtpConnection()
IF (lnSuccess = 0) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
ENDIF

? "SMTP connection opened."

*  ... send one or more emails here ...

*  Close the connection when done.
lnSuccess = loMailman.CloseSmtpConnection()
IF (lnSuccess = 0) THEN
    ? loMailman.LastErrorText
    RELEASE loMailman
    CANCEL
ENDIF

RELEASE loMailman