Question

我一直在尝试将SKPSMTPMessage用于我正在创建的iOS应用程序。该应用确实立即发送电子邮件，但似乎某些客户端的电子邮件视图存在一些问题。

我可以在Gmail上正确看到该电子邮件，但我无法正确使用Airmail，它显示为空电子邮件。

查看电子邮件的代码，对我来说似乎“好”，我不知道发生了什么。

以下是以电子邮件形式发送的代码。

Received-SPF: pass (google.com: domain of bounces+256657-1972-edited=gmail.com@sendgrid.info designates 208.115.235.3 as permitted sender) client-ip=208.115.235.3;
Date: Sun, 18 May 2014 09:58:11 +0100
Message-id: <1C33AFA6A19E4E8F8C9F6E631F64C8C0@smtp.sendgrid.net>
From:note@edited.com
To:edited@gmail.com
Content-Type: multipart/mixed; boundary="SKPSMTPMessage--Separator--Delimiter"
Mime-Version: 1.0
Subject:Message from Me

--SKPSMTPMessage--Separator--Delimiter
Content-Transfer-Encoding: 7bit
Content-Type: text/plain; charset=UTF-8;
 format=flowed

This is a test
--SKPSMTPMessage--Separator--Delimiter


--SKPSMTPMessage--Separator--Delimiter--

真的不知道这个问题。我唯一能想到的是，在电子邮件的末尾添加了两个分隔符，但我无法找到何时发生这种情况。

This is the file负责发送部件并附加分隔符分隔符。

- (BOOL)sendParts
{
    NSMutableString *message = [[NSMutableString alloc] init];
    static NSString *separatorString = @"--SKPSMTPMessage--Separator--Delimiter\r\n";

    CFUUIDRef   uuidRef   = CFUUIDCreate(kCFAllocatorDefault);
    NSString    *uuid     = (NSString *)CFBridgingRelease(CFUUIDCreateString(kCFAllocatorDefault, uuidRef));
    CFRelease(uuidRef);

    NSDate *now = [[NSDate alloc] init];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

    [dateFormatter setDateFormat:@"EEE, dd MMM yyyy HH:mm:ss Z"];

    [message appendFormat:@"Date: %@\r\n", [dateFormatter stringFromDate:now]];
    [message appendFormat:@"Message-id: <%@@%@>\r\n", [(NSString *)uuid stringByReplacingOccurrencesOfString:@"-" withString:@""], self.relayHost];

    [message appendFormat:@"From:%@\r\n", fromEmail];


    if ((self.toEmail != nil) && (![self.toEmail isEqualToString:@""]))
    {
        [message appendFormat:@"To:%@\r\n", self.toEmail];
    }

    if ((self.ccEmail != nil) && (![self.ccEmail isEqualToString:@""]))
    {
        [message appendFormat:@"Cc:%@\r\n", self.ccEmail];
    }

    [message appendString:@"Content-Type: multipart/mixed; boundary=\"SKPSMTPMessage--Separator--Delimiter\"\r\n"];
    [message appendString:@"Mime-Version: 1.0\r\n"];
    [message appendFormat:@"Subject:%@\r\n\r\n",subject];
    [message appendString:separatorString];

    NSData *messageData = [message dataUsingEncoding:NSUTF8StringEncoding allowLossyConversion:YES];

    NSLog(@"C: %s", [messageData bytes]);
    if (CFWriteStreamWriteFully((__bridge CFWriteStreamRef)outputStream, (const uint8_t *)[messageData bytes], [messageData length]) < 0)
    {
        return NO;
    }

    message = [[NSMutableString alloc] init];

    for (NSDictionary *part in parts)
    {
        // Checking it contains the actual part to avoid appending separators
        if ([part objectForKey:kSKPSMTPPartMessageKey]){
            if ([part objectForKey:kSKPSMTPPartContentDispositionKey])
            {
                [message appendFormat:@"Content-Disposition: %@\r\n", [part objectForKey:kSKPSMTPPartContentDispositionKey]];
            }
            [message appendFormat:@"Content-Transfer-Encoding: %@\r\n", [part objectForKey:kSKPSMTPPartContentTransferEncodingKey]];
            [message appendFormat:@"Content-Type: %@\r\n\r\n", [part objectForKey:kSKPSMTPPartContentTypeKey]];

            [message appendString:[part objectForKey:kSKPSMTPPartMessageKey]];
            [message appendString:@"\r\n"];

            [message appendString:separatorString];
        }
    }

    [message appendString:@"\r\n.\r\n"];

    NSLog(@"C: %@", message);
    if (CFWriteStreamWriteFully((__bridge CFWriteStreamRef)outputStream, (const uint8_t *)[message UTF8String], [message lengthOfBytesUsingEncoding:NSUTF8StringEncoding]) < 0)
    {
        return NO;
    }
    [self startLongWatchdog];
    return YES;
}

当记录时（NSLog(@"C: %@", message);），那两个最后的分隔符不存在。

任何人都有任何暗示吗？

Answer 1

该库已经自动创建了一个包含以下内容的标头：

Content-Type: multipart/mixed; boundary=SKPSMTPMessage--Separator--Delimiter

该库还负责在您指定为消息部分的项目之间附加这些边界分隔符。

因此，只需创建一堆消息部分，如下所示：

let fileMessagePart1 :[String : String] = [
    kSKPSMTPPartContentTypeKey: "image/jpg;\r\n\tname=\"\(fileName)\"",
    kSKPSMTPPartContentDispositionKey: "attachment;\r\n\tfilename=\"\(fileName)\"",
    kSKPSMTPPartMessageKey: fileData.encodeBase64ForData(),
    kSKPSMTPPartContentTransferEncodingKey: "base64",
]

您可以将它们全部传递给库：

let emailMessage = SKPSMTPMessage()
// ...
emailMessage.parts = [fileMessagePart1, fileMessagePart2, fileMessagePart3]

此示例仅发送了三个图像部分，但是您还可以包括纯文本部分或任何其他类型的消息部分。

Answer 2

正如我想的那样，问题在于，根本不需要额外的分隔符，因此失败了。

所以，在sendParts方法上，我改变了这个：

[message appendString:@"Content-Type: multipart/mixed; boundary=\"SKPSMTPMessage--Separator--Delimiter\"\r\n"];
[message appendString:@"Mime-Version: 1.0\r\n"];
[message appendFormat:@"Subject:%@\r\n\r\n",subject];
[message appendString:separatorString];

对此：

[message appendString:@"Content-Type: multipart/mixed; boundary=\"SKPSMTPMessage--Separator--Delimiter\"\r\n"];
[message appendString:@"Mime-Version: 1.0\r\n"];
[message appendFormat:@"Subject:%@\r\n\r\n",subject];

基本上，删除[message appendString:separatorString];

然后，在循环中：

for (NSDictionary *part in parts)
{
    // Checking it contains the actual part to avoid appending separators
    if ([part objectForKey:kSKPSMTPPartMessageKey]){
        if ([part objectForKey:kSKPSMTPPartContentDispositionKey])
        {
            [message appendFormat:@"Content-Disposition: %@\r\n", [part objectForKey:kSKPSMTPPartContentDispositionKey]];
        }

        [message appendFormat:@"Content-Transfer-Encoding: %@\r\n", [part objectForKey:kSKPSMTPPartContentTransferEncodingKey]];
        [message appendFormat:@"Content-Type: %@\r\n\r\n", [part objectForKey:kSKPSMTPPartContentTypeKey]];

        [message appendString:[part objectForKey:kSKPSMTPPartMessageKey]];
        [message appendString:@"\r\n"];

        [message appendString:separatorString];
    }
}

我将separatorString移到了追加操作的顶部：

for (NSDictionary *part in parts)
{
    // Checking it contains the actual part to avoid appending separators
    if ([part objectForKey:kSKPSMTPPartMessageKey]){

        [message appendString:separatorString];

        if ([part objectForKey:kSKPSMTPPartContentDispositionKey])
        {
            [message appendFormat:@"Content-Disposition: %@\r\n", [part objectForKey:kSKPSMTPPartContentDispositionKey]];
        }

        [message appendFormat:@"Content-Transfer-Encoding: %@\r\n", [part objectForKey:kSKPSMTPPartContentTransferEncodingKey]];
        [message appendFormat:@"Content-Type: %@\r\n\r\n", [part objectForKey:kSKPSMTPPartContentTypeKey]];

        [message appendString:[part objectForKey:kSKPSMTPPartMessageKey]];
        [message appendString:@"\r\n"];
    }
}

这将解决问题！

如何发送SKPSMTPMessage的电子邮件，它将在电子邮件客户端解析好？

2 个答案: