使用SKPSMTPMessage发送的电子邮件附件在iOS邮件客户端中显示为联系人

我已经使用这个有用的库测试了发送附件的代码：

电子邮件似乎发送正确，当我通过hotmail或gmail客户端查看时，我看到了jpeg图像。但是，当我通过iOS邮件客户端查看同一封电子邮件时，附件显示为“联系人”，单击此按钮，我可以选择将文件另存为新联系人

我尝试从hotmail发送带有jpeg附件的电子邮件，当我这样做时，它会正确地显示在iOS客户端中

有人知道这是代码还是iOS弄错了吗

//the guts of the message.
SKPSMTPMessage *testMsg = [[SKPSMTPMessage alloc] init];
testMsg.fromEmail = @"aname@gmail.com";
testMsg.toEmail = @"aname@gmail.com";
testMsg.relayHost = @"smtp.gmail.com";
testMsg.requiresAuth = YES;
testMsg.login = @"aname@gmail.com";
testMsg.pass = @"password";
testMsg.subject = @"The message subject";
testMsg.wantsSecure = YES; // smtp.gmail.com doesn't work without TLS!

// Only do this for self-signed certs!
// testMsg.validateSSLChain = NO;
testMsg.delegate = self;

//email contents
NSDate* now = [NSDate date];
NSString * bodyMessage = [NSString stringWithFormat:@"The message body"];

// email image if it exists

NSString  *jpgPath = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/file.jpeg"];
NSFileManager *fileManager = [NSFileManager defaultManager];

NSMutableArray* parts = [[NSMutableArray alloc] init];

// add plain part
NSDictionary *plainPart = [NSDictionary dictionaryWithObjectsAndKeys:@"text/plain",kSKPSMTPPartContentTypeKey,
                           bodyMessage ,kSKPSMTPPartMessageKey,@"8bit",kSKPSMTPPartContentTransferEncodingKey,nil];

[parts addObject: plainPart];


// add attachments
NSData *attachmentData = [NSData dataWithContentsOfFile:jpgPath]; 

NSString *directory = @"text/directory;\r\n\tx-unix-mode=0644;\r\n\tname=\"file.jpeg\"";
NSString *attachment = @"attachment;\r\n\tfilename=\"file.jpeg\"";

NSDictionary *image_part = [NSDictionary dictionaryWithObjectsAndKeys:
                                directory,kSKPSMTPPartContentTypeKey,
                                attachment,kSKPSMTPPartContentDispositionKey,
                                [attachmentData encodeBase64ForData],kSKPSMTPPartMessageKey,
                                @"base64",kSKPSMTPPartContentTransferEncodingKey,nil];

[parts addObject: image_part];
testMsg.parts = parts;
[testMsg send];

尝试改变

 NSString *directory = @"text/directory;...

到

我希望这对你有用

---

Steffen

这有用吗？我正在尝试将jpeg图像添加到电子邮件中。似乎对我不起作用。我试图用后台线程发送一封电子邮件，但最终还是被拒绝了。我求助于使用代理服务器来传递消息。

 NSString *directory = @"text/jpeg;...