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(xiàn)發(fā)送Email是最常規(guī)的方法，該方法有相應(yīng)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(guān)的數(shù)據(jù)結(jié)構(gòu)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(fā)送，將郵件放到隊列中 
 MFMailComposeResultFailed//用戶試圖保存或者發(fā)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(shè)置郵件賬戶，則會返回NO，你可以用根據(jù)返回值來決定是使用MFMailComposeViewController 還是 mailto://的傳統(tǒng)方法，也或者，你可以選擇上文中提到的skpsmtpmessage來實現(xiàn)發(fā)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(guān)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(yīng)該支持。關(guān)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(yīng)的Delegate方法來讓你更好的獲知發(fā)送的狀態(tài). 
 
-(void)messageSent:(SKPSMTPMessage *)message; 
-(void)messageFailed:(SKPSMTPMessage *)message error:(NSError *)error;