Objective-C

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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Objective-C

#import <CkoMailMan.h>

BOOL success = NO;

//  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.

CkoMailMan *mailman = [[CkoMailMan alloc] init];

//  Configure the SMTP server connection.
mailman.SmtpHost = @"smtp.example.com";
mailman.SmtpPort = [NSNumber numberWithInt:465];
mailman.SmtpSsl = YES;
mailman.SmtpUsername = @"user@example.com";
mailman.SmtpPassword = @"myPassword";

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

success = [mailman OpenSmtpConnection];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

NSLog(@"%@",@"SMTP connection opened.");

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

//  Close the connection when done.
success = [mailman CloseSmtpConnection];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}