通过 ews 发送一封简单的电子邮件按预期工作 - 从我的帐户到我的帐户：
ExchangeService ews = new ExchangeService(ExchangeVersion.Exchange2010);
ews.AutodiscoverUrl("myname@mydomain.com");
EmailMessage email = new EmailMessage(ews);
email.ToRecipients.Add("myname@mydomain.com");
email.Subject = "HelloWorld";
email.Body = new MessageBody("This is the first email I've sent by using the EWS Managed API");
email.Send();
简单地尝试模拟，它也按预期工作 - 在最后一行，它返回我不允许模拟的错误：
ExchangeService ews = new ExchangeService(ExchangeVersion.Exchange2010);
ews.AutodiscoverUrl("myname@mydomain.com");
ews.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, "testuser@mydomain.com");
EmailMessage email = new EmailMessage(ews);
email.ToRecipients.Add("myname@mydomain.com");
email.Subject = "HelloWorld";
email.Body = new MessageBody("This is the first email I've sent by using the EWS Managed API");
email.Send();
现在我尝试使用我的应用程序服务帐户登录：
ExchangeService ews = new ExchangeService(ExchangeVersion.Exchange2010);
ews.Credentials = new NetworkCredential("service", "1234", "mydomain.com");
//ews.Credentials = new WebCredentials("service", "1234");
ews.AutodiscoverUrl("myname@mydomain.com");
//ews.AutodiscoverUrl("service@mydomain.com");
ews.ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, "testuser@mydomain.com");
EmailMessage email = new EmailMessage(ews);
email.ToRecipients.Add("myname@mydomain.com");
email.Subject = "HelloWorld";
email.Body = new MessageBody("This is the first email I've sent by using the EWS Managed API");
email.Send();
但是这里它在自动发现行中抛出一个错误：“AutodiscoverLocalException：找不到自动发现服务。”
服务帐户在 AD 和 Exchange 中设置，密码和 smtp 地址正确。
为什么它不起作用？如何检查导致该错误的原因？