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如何在您模拟且没有邮箱的情况下发送带有附件的电子邮件

impersonation exchangewebservices exchange-server email c#

Jean-Bernard Pellerin · 技术社区 · 6 年前

我有一个服务在机器上作为计划作业运行。它在一个没有自己邮箱的服务帐户下运行。我们希望它能从团队的共享收件箱发送电子邮件。
我试着在这里使用模拟。

var service = new ExchangeService
{
    TraceEnabled = true,
    ImpersonatedUserId = new ImpersonatedUserId(ConnectingIdType.SmtpAddress, Resources.EmailUsername)
};

service.AutodiscoverUrl(Resources.EmailUsername, RedirectionUrlValidationCallback);

var email = new EmailMessage(service);

if (!string.IsNullOrWhiteSpace(recipients))
{
    foreach (var recipient in recipients.Split(','))
    {
        email.ToRecipients.Add(recipient.Trim());
    }
}

email.Subject = subject;
email.Body = new MessageBody(BodyType.HTML, body);

if (attachmentName != null && attachment != null)
{
    email.Attachments.AddFileAttachment(attachmentName, attachment);                        
}

email.Send();

它失败了,我得到一个例外,说:

当以没有邮箱的帐户发出请求时必须为任何可分辨邮件指定邮箱主smtp地址文件夹ID。

1 回复 | 直到 6 年前

Jean-Bernard Pellerin 6 年前

这个 TraceEnabled 这一部分让我注意到了 MessageDisposition=SaveOnly 是在xml中设置的。我查了一下,觉得我只想要SendOnly。

经过多次搜索,我终于来到这里: https://github.com/OfficeDev/ews-managed-api/blob/master/Core/ServiceObjects/Items/EmailMessage.cs
这表明:

public void Send()
{
    this.InternalSend(null, MessageDisposition.SendOnly);
}

看起来这正是我想要的。。。但是:

private void InternalSend(FolderId parentFolderId, MessageDisposition messageDisposition)
{
    this.ThrowIfThisIsAttachment();

    if (this.IsNew)
    {
        if ((this.Attachments.Count == 0) || (messageDisposition == MessageDisposition.SaveOnly))
        {
            this.InternalCreate(
                parentFolderId,
                messageDisposition,
                null);
        }
        else
        {
            // If the message has attachments, save as a draft (and add attachments) before sending.
            this.InternalCreate(
                null,                           // null means use the Drafts folder in the mailbox of the authenticated user.
                MessageDisposition.SaveOnly,
                null);

            this.Service.SendItem(this, parentFolderId);
        }
    }
    ...

这两条评论是最有启发性的部分。附件将保存到运行流程的用户的草稿文件夹中。
为了避免这种情况,我们必须在调用Send时保存消息。让我们确保它保存在我们知道存在的邮箱中。因此,我们删除模拟,添加一个步骤来保存它,并修改From字段。然后我们可以安全地发送消息,它将从草稿文件夹中删除自己。

var service = new ExchangeService
{
    TraceEnabled = true
};

service.AutodiscoverUrl(Resources.EmailUsername, RedirectionUrlValidationCallback);

var email = new EmailMessage(service);

if (!string.IsNullOrWhiteSpace(recipients))
{
    foreach (var recipient in recipients.Split(','))
    {
        email.ToRecipients.Add(recipient.Trim());
    }
}

email.Subject = subject;
email.Body = new MessageBody(BodyType.HTML, body);

if (attachmentName != null && attachment != null)
{
    email.Attachments.AddFileAttachment(attachmentName, attachment);                        
}

var folderId = new FolderId(WellKnownFolderName.SentItems, Resources.EmailUsername);

email.Save(folderId);
email.From = Resources.EmailUsername;
email.Send();