这个问题发生在我们的一位客户身上，我无法使用相同版本的Outlook在我身边复制。我的客户和我正在使用安装了Outlook 2016的Office 365。当他通过Outlook Redemption（用于Outlook集成的第三方程序）在我们的程序中发送电子邮件时，邮件卡在他的发件箱中。
如果他双击该消息（因此它在Outlook中弹出），他可以点击发送按钮，它将成功发送。如果他们使用旧版本的Outlook（2010），这不是问题。我当时将它们升级到最新版本的Outlook Redmeption（2016年5月7日发布），但看起来他们几天前刚刚推出新版本。我很快就会尝试，但更新日志并未提及邮件卡在发件箱中。
我还注意到，他的发件箱中的电子邮件似乎是“草稿”中的电子邮件。在他们的发件箱上，他们有一个＆＃39;发送＆＃39;他们的象征。这似乎很重要，但我不确定我能做些什么。
此外，点击发送/接收所有文件夹也无济于事。
我的代码如下。感谢您的帮助。
public static bool SendMessage(Recipients recipients, string[] addressListReplyTo, string subject, string body, string[] attachments, bool requestReadReceipt, Log log, bool isHtmlBody = false)
{
RDOSession session = null;
RDOMail mail;
RDOFolder folder;
bool result = true;
session = GetSessionAndLogon(log);
if (session == null)
return false;
folder = session.GetDefaultFolder(rdoDefaultFolders.olFolderOutbox);
mail = folder.Items.Add();
if (isHtmlBody)
mail.HTMLBody = body;
else
mail.Body = body;
mail.Subject = subject;
mail.ReadReceiptRequested = requestReadReceipt;
foreach (string attachment in attachments)
{
if (attachment != "")
mail.Attachments.Add(attachment);
}
foreach (string address in addressListReplyTo)
{
if (address != "")
mail.ReplyRecipients.Add(address);
}
foreach (string address in recipients.To)
{
if (address != "")
mail.Recipients.Add(address).Type = 1;
}
foreach (string address in recipients.Cc)
{
if (address != "")
mail.Recipients.Add(address).Type = 2;
}
foreach (string address in recipients.Bcc)
{
if (address != "")
mail.Recipients.Add(address).Type = 3;
}
foreach (RDORecipient recipient in mail.Recipients)
{
if (!OutlookMailEngine64.existsName(recipient.Name, session, log == null ? null : log))
result = false;
}
if (result)
{
try
{
mail.Send();
result = true;
}
catch (System.Runtime.InteropServices.COMException ex)
{
string message = "Error while sending email: " + ex.Message;
if (log != null)
log.Message(message);
if (OutlookMailEngine64.DiagnosticMode)
MessageBox.Show(message);
throw new EmailLibraryException(EmailLibraryException.ErrorType.InvalidRecipient, "One or more recipients are invalid (use OutlookMailEngine64.ValidateAddresses first)", ex);
}
}
if (session.LoggedOn)
session.Logoff();
return result;
}
答案 0 :(得分：1)
请记住，邮件提交是异步的，除非您使用在线Exchange存储（存储和传输提供程序紧密耦合），否则它将自动触发。
您可以通过在Outlook对象模型中调用Namespace.SendAndReceive来强制发送/接收。
答案 1 :(得分：1)
Dmitry通过电子邮件与我合作。对我来说，解决方案是将RDO替换为SafeMailItem对象。这是我的方法的更新版本，因此您可以看到更改：
private static bool SendSafeMessage(Recipients recipients, string[] addressListReplyTo, string subject, string body, string[] attachments, bool requestReadReceipt, Log log, bool isHtmlBody = false)
{
//This method was added because sometimes messages were getting stuck in the Outlook Outbox and this seems to solve that
bool result = true;
Microsoft.Office.Interop.Outlook.Application application = new Microsoft.Office.Interop.Outlook.Application();
Microsoft.Office.Interop.Outlook.NameSpace namespaceMAPI = application.GetNamespace("MAPI");
namespaceMAPI.Logon();
RDOSession session = null;
session = GetSessionAndLogon(log); //TODO: I'm creating a 2nd session here which is wasteful
SafeMailItem safeMail = Redemption.RedemptionLoader.new_SafeMailItem();
Microsoft.Office.Interop.Outlook.MailItem outlookMailItem = (Microsoft.Office.Interop.Outlook.MailItem)application.CreateItem(Microsoft.Office.Interop.Outlook.OlItemType.olMailItem);
safeMail.Item = outlookMailItem;
if (isHtmlBody)
outlookMailItem.HTMLBody = body;
else
safeMail.Body = body;
outlookMailItem.Subject = subject;
outlookMailItem.ReadReceiptRequested = requestReadReceipt;
foreach (string attachment in attachments)
{
if (attachment != "")
safeMail.Attachments.Add(attachment);
}
foreach (string address in addressListReplyTo)
{
if (address != "")
safeMail.ReplyRecipients.Add(address);
}
foreach (string address in recipients.To)
{
if (address != "")
safeMail.Recipients.Add(address).Type = 1;
}
foreach (string address in recipients.Cc)
{
if (address != "")
safeMail.Recipients.Add(address).Type = 2;
}
foreach (string address in recipients.Bcc)
{
if (address != "")
safeMail.Recipients.Add(address).Type = 3;
}
foreach (Microsoft.Office.Interop.Outlook.Recipient recipient in outlookMailItem.Recipients)
{
if (!OutlookMailEngine64.existsName(recipient.Name, session, log == null ? null : log))
result = false;
}
if (result)
{
try
{
safeMail.Send();
result = true;
}
catch (System.Runtime.InteropServices.COMException ex)
{
string message = "Error while sending email: " + ex.Message;
if (log != null)
log.Message(message);
if (OutlookMailEngine64.DiagnosticMode)
MessageBox.Show(message);
throw new EmailLibraryException(EmailLibraryException.ErrorType.InvalidRecipient, "One or more recipients are invalid (use OutlookMailEngine64.ValidateAddresses first)", ex);
}
}
if (session.LoggedOn)
session.Logoff();
namespaceMAPI.Logoff();
return result;
}