Question

尝试使用Exchange Web Services Managed API针对 Exchange Server 2010 SP1 发送电子邮件时，将使用ErrorCode {{3}引发 ServiceException 当收件人的电子邮件地址（@的左侧）包含，在这种情况下，丹麦字母æøå。

这些字符是否仅在电子邮件地址的本地部分中被允许，或者我应该以某种方式对地址进行编码？

更新：以下是测试源代码和跟踪数据：

var service = new ExchangeService(ExchangeVersion.Exchange2010_SP1);
service.AutodiscoverUrl("my@email.com");
EmailMessage email = new EmailMessage(service);
email.Body = "Test";
email.Subject = "Test";
email.ToRecipients.Add("æøå@domain.com");
email.Send();

来自EWS的跟踪数据显示以下内容：

请求标题：

POST /EWS/Exchange.asmx HTTP/1.1
Content-Type: text/xml; charset=utf-8
Accept: text/xml
User-Agent: ExchangeServicesClient/14.03.0032.000
Accept-Encoding: gzip,deflate

请求：

<?xml version="1.0" encoding="utf-8"?>
<soap:Envelope xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:soap="http://schemas.xmlsoap.org/soap/envelope/">
  <soap:Header>
    <t:RequestServerVersion Version="Exchange2010_SP1" />
  </soap:Header>
  <soap:Body>
    <m:CreateItem MessageDisposition="SendOnly">
      <m:Items>
        <t:Message>
          <t:Subject>Test</t:Subject>
          <t:Body BodyType="HTML">Test</t:Body>
          <t:ToRecipients>
            <t:Mailbox>
              <t:EmailAddress>æøå@domain.com</t:EmailAddress>
            </t:Mailbox>
          </t:ToRecipients>
        </t:Message>
      </m:Items>
    </m:CreateItem>
  </soap:Body>
</soap:Envelope>

响应：

<?xml version="1.0" encoding="utf-8"?>
<s:Envelope xmlns:s="http://schemas.xmlsoap.org/soap/envelope/">
  <s:Header>
    <h:ServerVersionInfo MajorVersion="14" MinorVersion="1" MajorBuildNumber="438" MinorBuildNumber="0" Version="Exchange2010_SP1" xmlns:h="http://schemas.microsoft.com/exchange/services/2006/types" xmlns="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" />
  </s:Header>
  <s:Body xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
    <m:CreateItemResponse xmlns:m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:t="http://schemas.microsoft.com/exchange/services/2006/types">
      <m:ResponseMessages>
        <m:CreateItemResponseMessage ResponseClass="Error">
          <m:MessageText>One or more recipients are invalid.</m:MessageText>
          <m:ResponseCode>ErrorInvalidRecipients</m:ResponseCode>
          <m:DescriptiveLinkKey>0</m:DescriptiveLinkKey>
          <m:Items />
        </m:CreateItemResponseMessage>
      </m:ResponseMessages>
    </m:CreateItemResponse>
  </s:Body>
</s:Envelope>

最后，在Outlook中创建一个这样的地址的电子邮件会显示以下消息：

We wont be able to deliver this message to ___ because the email address is no longer valid

Answer 1

根据处理Exchange收件人解析的这篇文章，您可能需要使用以下方法对这些字符进行编码：

字母数字字符，等号（=）和连字符（ - ）不需要编码。其他字符使用以下编码语法：正斜杠（/）由下划线（_）替换。其他US-ASCII 字符由加号（+）及其两位数字代替 ASCII值以十六进制写入。例如，空间 character的编码值为+20。

http://technet.microsoft.com/en-us/library/bb430743(v=exchg.141).aspx

所以你的“æøå@domain.com”的例子将成为“+ e6 +f8 + e5@domain.com”

修改

如果使用特殊字符，地址的“域”部分也需要使用不同的方法进行编码。

以下是我使用RFC 5321和RFC 3461规范对电子邮件地址进行编码的GetExchangeEncodedRecipient辅助方法。

public static string GetExchangeEncodedRecipient(string recipient) { int atIdx = recipient.LastIndexOf('@'); if (atIdx < 0) { throw new ArgumentException("Unable to parse domain portion of \"recipient\" email address."); } string namepart = recipient.Substring(0, atIdx); string domainPart = recipient.Substring(atIdx + 1); //need to encode any special characters in the domain name System.Globalization.IdnMapping punycode = new System.Globalization.IdnMapping(); domainPart = "@" + punycode.GetAscii(domainPart); return String.Concat(namepart.Select(c => GetExchangeEncodedChar(c))) + domainPart; } private static string GetExchangeEncodedChar(char c) { string encodedChar = c.ToString(); int charASCIICode = (int)c; //Encode according to RFC5321, https://tools.ietf.org/html/rfc5321#section-4.1.2 // which references rfc3461 "xtext" format. https://tools.ietf.org/html/rfc3461#section-4 if(charASCIICode >= 33 && charASCIICode <= 126 && c != '+' && c != '=') { //This is a character in the valid 33-126 ASCII range for email addresses, which does not need encoded. return c.ToString(); } else if(c == '/'){ //A forward slash (/) is replaced by an underscore (_). return "_"; } else { return "+" + ((int)c).ToString("x2").ToUpper(); } }

然后您可以使用GetExchangeEncodedRecipient对地址进行编码。这是一个例子：

string recipient = @"user1æøå@dømain.com"; string encodedAddress = GetExchangeEncodedRecipient(recipient); Console.WriteLine("Original: {0}, Encoded: {1}", recipient, encodedAddress);

对于上面的示例收件人，将输出：

原文：user1æøå@dømain.com，编码：user1 + E6 + F8 + E5@xn--dmain-vua.com

如果你使用的“普通”电子邮件地址不包含“普通”ASCII范围之外的任何字符，那么它会返回相同的字符串。

原文：jsmith01@gmail.com，编码：jsmith01@gmail.com

使用Exchange Web服务发送包含特殊字符的电子邮件

1 个答案: