Objective-C

SMTP Inspection

See more SMTP Examples

Examine an SMTP session to view all communications sent to the SMTP server. Objective-C

#import <CkoMailMan.h>
#import <CkoEmail.h>
#import <NSString.h>

BOOL success = NO;

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

mailman.SmtpHost = @"smtp.example.com";
mailman.SmtpUsername = @"myUsername";
mailman.SmtpPassword = @"myPassword";

mailman.SmtpPort = [NSNumber numberWithInt:465];
mailman.StartTLS = YES;

CkoEmail *email = [[CkoEmail alloc] init];

email.Subject = @"This is a test";
email.Body = @"This is a test";
email.From = @"Alex <alex@example.com>";
[email AddTo: @"Christoph" emailAddress: @"christoph@example2.com"];
[email AddBcc: @"Victor" emailAddress: @"victor@example3.com"];

//  Generate the MIME that is sent when SendEmail is called
NSString *mimeStr = [mailman RenderToMime: email];
NSLog(@"%@",mimeStr);

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

success = [mailman CloseSmtpConnection];
if (success != YES) {
    NSLog(@"%@",@"Connection to SMTP server not closed cleanly.");
}

//  Examine the SMTP session log.
NSLog(@"%@",@"----");
NSLog(@"%@",@"Smtp Session Log:");
NSLog(@"%@",mailman.SmtpSessionLog);

//  ---------------------------------------------------
//  Sample output:
//  ---------------------------------------------------

//  MIME-Version: 1.0
//  Date: Fri, 06 Mar 2026 16:21:00 -0600
//  Message-ID: <A5DC25990C93EC2676F4FBB2BB3BFA9EB34FF9D3@CHILKAT25>
//  Content-Type: text/plain; charset=us-ascii; format=flowed
//  Content-Transfer-Encoding: 7bit
//  X-Priority: 3 (Normal)
//  Subject: This is a test
//  From: Alex <alex@example.com>
//  To: Christoph <christoph@example2.com>
//  Bcc: Victor <victor@example3.com>
//  
//  This is a test
//  ----
//  Smtp Session Log:
//  220 smtp.example.com ESMTP Amazon WorkMail SMTP Service
//  EHLO MYCOMPUTER<CRLF>
//  250-smtp.example.com
//  250-8BITMIME
//  250-AUTH PLAIN LOGIN
//  250 Ok
//  AUTH LOGIN<CRLF>
//  334 VXNlcm5hbWU6
//  YWRtaW5AY2hpbGthdHNvZnQuY29t<CRLF>
//  334 UGFzc3dvcmQ6
//  {PasswordOrCredentials}
//  235 Authentication successful.
//  MAIL FROM:<alex@example.com><CRLF>
//  250 Ok
//  RCPT TO:<christoph@example2.com><CRLF>
//  250 Ok
//  RCPT TO:<victor@example3.com><CRLF>
//  250 Ok
//  DATA<CRLF>
//  354 End data with <CR><LF>.<CR><LF>
//  {388 bytes} <--- The MIME source of the email (examined via RenderToMime) was sent here.
//  <CRLF>.<CRLF>
//  250 Ok
//  QUIT<CRLF>
//  221 Bye