如何使用Exchange Web服务发送包含text/plain和text/html的多部分电子邮件？

Question

我通过命令行使用wsdl工具生成了一个名称空间，方法是将其指向https://exchange-server/EWS/Services.wsdl。

使用以下代码，我可以成功地发送电子邮件：

const string EWS_USERNAME = "user";
const string EWS_PASSWORD = "pass";
const string EWS_DOMAIN = "domain";
const string EWS_URL = "https://exchange-server/EWS/Exchange.asmx";

var ews = new ExchangeServiceBinding();
ews.Credentials = new NetworkCredential(EWS_USERNAME, EWS_PASSWORD, EWS_DOMAIN);
ews.Url = EWS_URL;

var email = new MessageType();
email.IsFromMe = false;
email.From = new SingleRecipientType();
email.From.Item = new EmailAddressType();
email.From.Item.EmailAddress = "from@example.com";

email.ToRecipients = new EmailAddressType[1] { new EmailAddressType { EmailAddress = "recipient@example.com" } };

email.Subject = "Subject";

email.Body = new BodyType();
email.Body.BodyType1 = BodyTypeType.HTML;
email.Body.Value = "<strong>Test</strong>";

var emailToSave = new CreateItemType();
emailToSave.Items = new NonEmptyArrayOfAllItemsType();

emailToSave.Items.Items = new ItemType[1] { email };
emailToSave.MessageDisposition = MessageDispositionType.SendAndSaveCopy;
emailToSave.MessageDispositionSpecified = true;

ews.CreateItemCompleted += new CreateItemCompletedEventHandler(ExchangeWebServices_CreateItemCompleted);

ews.CreateItemAsync(emailToSave, callbackState);

我的问题是，如何发送同时包含HTML和纯文本正文的多部分电子邮件？

Answer 1

Exchange会自动生成邮件的纯文本版本。你不需要做任何事情就能实现。