NSString *url = [NSString stringWithString: @"mailto:foo@example.com?cc=bar@example.com&subject=Greetings%20from%20Cupertino!&body=Wish%20you%20were%20here!"]; [[UIApplication sharedApplication] openURL: [NSURL URLWithString: url]]; 

#import <MessageUI/MFMailComposeViewController.h>;  MFMailComposeViewController* controller = [[MFMailComposeViewController alloc] init]; controller.mailComposeDelegate = self; [controller setSubject:@"My Subject"]; [controller setMessageBody:@"Hello there." isHTML:NO]; [self presentModalViewController:controller animated:YES]; [controller release]; //使用該方法實現發送Email是最常規的方法，該方法有相應的MFMailComposeViewControllerDelegate事件:  - (void)mailComposeController:(MFMailComposeViewController*)controller    didFinishWithResult:(MFMailComposeResult)result       error:(NSError*)error; {  if (result == MFMailComposeResultSent) {  NSLog(@"It's away!");  }  [self dismissModalViewControllerAnimated:YES]; } //有一些相關的數據結構的定義在頭文件中都有具體的描述：  enum MFMailComposeResult {  MFMailComposeResultCancelled,//用戶取消編輯郵件  MFMailComposeResultSaved,//用戶成功保存郵件  MFMailComposeResultSent,//用戶點擊發送，將郵件放到隊列中  MFMailComposeResultFailed//用戶試圖保存或者發送郵件失敗 }; typedef enum MFMailComposeResult MFMailComposeResult; // iOS3.0以上有效 //在頭文件中MFMailComposeViewController的部分方法順便提及：  + (BOOL)canSendMail __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_3_0); //如果用戶沒有設置郵件賬戶，則會返回NO，你可以用根據返回值來決定是使用MFMailComposeViewController 還是 mailto://的傳統方法，也或者，你可以選擇上文中提到的skpsmtpmessage來實現發送Email的功能。 - (void)addAttachmentData:(NSData *)attachment mimeType:(NSString *)mimeType fileName:(NSString *)filename; //NSData類型的attachment自然不必多說，關于mimeType需要一點說明，官方文檔里給出了一個鏈接http://www.iana.org/assignments/media-types/ ，這里列出的所有的類型都應該支持。關于mimeType的用處，更多需要依靠搜索引擎了 =] 

    SKPSMTPMessage *testMsg = [[SKPSMTPMessage alloc] init];   testMsg.fromEmail = @"test@gmail.com";   testMsg.toEmail =@"to@gmail.com";   testMsg.relayHost = @"smtp.gmail.com";   testMsg.requiresAuth = YES;   testMsg.login = @"test@gmail.com";   testMsg.pass = @"test";   testMsg.subject = [NSString stringWithCString:"測試" encoding:NSUTF8StringEncoding];   testMsg.bccEmail = @"bcc@gmail.com";   testMsg.wantsSecure = YES; // smtp.gmail.com doesn't work without TLS!    // Only do this for self-signed certs!   // testMsg.validateSSLChain = NO;   testMsg.delegate = self;    NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:@"text/plain",kSKPSMTPPartContentTypeKey,          [NSString stringWithCString:"測試正文" encoding:NSUTF8StringEncoding],kSKPSMTPPartMessageKey,@"8bit",kSKPSMTPPartContentTransferEncodingKey,nil];     NSString *vcfPath = [[NSBundle mainBundle] pathForResource:@"test" ofType:@"vcf"];    NSData *vcfData = [NSData dataWithContentsOfFile:vcfPath];     NSDictionary *vcfPart = [NSDictionary dictionaryWithObjectsAndKeys:@"text/directory;/r/n/tx-unix-mode=0644;/r/n/tname=/"test.vcf/"",kSKPSMTPPartContentTypeKey,           @"attachment;/r/n/tfilename=/"test.vcf/"",kSKPSMTPPartContentDispositionKey,[vcfData encodeBase64ForData],kSKPSMTPPartMessageKey,@"base64",kSKPSMTPPartContentTransferEncodingKey,nil];    testMsg.parts = [NSArray arrayWithObjects:plainPart,vcfPart,nil];    [testMsg send]; //該類也提供了相應的Delegate方法來讓你更好的獲知發送的狀態.  -(void)messageSent:(SKPSMTPMessage *)message; -(void)messageFailed:(SKPSMTPMessage *)message error:(NSError *)error;