Perl

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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Perl

use chilkat();

$success = 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.

$mailman = chilkat::CkMailMan->new();

#  Configure the SMTP server connection.
$mailman->put_SmtpHost("smtp.example.com");
$mailman->put_SmtpPort(465);
$mailman->put_SmtpSsl(1);
$mailman->put_SmtpUsername('user@example.com');
$mailman->put_SmtpPassword("myPassword");

#  Explicitly open (and authenticate) the SMTP connection.

$success = $mailman->OpenSmtpConnection();
if ($success == 0) {
    print $mailman->lastErrorText() . "\r\n";
    exit;
}

print "SMTP connection opened." . "\r\n";

#  ... send one or more emails here ...

#  Close the connection when done.
$success = $mailman->CloseSmtpConnection();
if ($success == 0) {
    print $mailman->lastErrorText() . "\r\n";
    exit;
}