MFMailComposeViewController *mailC=[[MFMailComposeViewControlleralloc] init];

            if ([MFMailComposeViewControllercanSendMail]) {

                mailC.mailComposeDelegate=self;

                [mailC setSubject:@"I have a something to do"];

                NSString *emailBody = @"this is text email";

                [mailC setMessageBody:emailBody isHTML:YES];

                [selfpresentModalViewController:mailC animated:YES];

            }

            [mailC release]; 

-(void)mailComposeController:(MFMailComposeViewController*)controller didFinishWithResult :(MFMailComposeResult)result error:(NSError*)error {

    NSString *msg;

    switch (result)

    {

        case MFMailComposeResultCancelled:

            msg = @"邮件发送取消";

            break;

        case MFMailComposeResultSaved:

            msg = @"邮件保存成功";

           // [self alertWithTitle:nil msg:msg];

            break;

        case MFMailComposeResultSent:

            msg = @"邮件发送成功";

            //[self alertWithTitle:nil msg:msg];

            break;

        case MFMailComposeResultFailed:

            msg = @"邮件发送失败";

            //[self alertWithTitle:nil msg:msg];

            break;

        default:

            break;

    }

    UIAlertView *al = [[UIAlertViewalloc] initWithTitle:msg message:@""delegate:nilcancelButtonTitle:@"OK"otherButtonTitles:nil];

    [al show];

    [al release];

   // NSLog(@"msg=%@",msg);

    [selfdismissModalViewControllerAnimated:YES];

}

要添加messageui.framework！需要包含#import <MessageUI/MessageUI.h>