无法通过Microsoft Outlook发送电子邮件？如果您的电子邮件卡在发件箱^(Outbox)中，错误代码为 17884，那么这篇文章适合您。Outlook 是全球最流行的电子邮件客户端^{(email clients)}之一，当您的Outlook帐户自动断开连接并且您发送的电子邮件卡在发件箱^(Outbox)中时，就会发生此错误。即使重新启动应用程序也无济于事，电子邮件仍然卡在发件箱^(Outbox)中。

Unknown error has occurred in Outlook. Outlook Error Code 17884, Mail could not be sent.

让我们检查导致此Outlook错误代码 17884 的原因以及我们如何修复它。

Outlook 错误代码 17884

此错误可能有许多不同的原因，其中包括 -

1. 连接不良
2. 大型电子邮件附件。
3. Exchange 服务器的问题
4. 垃圾邮件
5. 每日限额
6. 错误的电子邮件地址
7. Outlook 的过时版本

Outlook 中出现未知^(Unknown)错误

如何修复 Outlook 错误 17884

1] 连接不良

最常见的错误是连接不良。间歇性互联网连接会自动断开Outlook帐户，您的电子邮件将卡在发件箱^(Outbox)中。在这种情况下，请检查您的 Internet 连接，重新启动Outlook，然后再次尝试发送电子邮件。大多数时候它都有效。

2]大型附件

带有大附件的电子邮件也可能无法通过。使用Outlook，您可以发送最大 20 MB^(MBs)的附件，这适用于所有版本。如果超出允许的附件限制，您的电子邮件将不会送达，并且可能会卡在显示错误 17884的发件箱中。^(Outbox)

3] Exchange服务器的问题

检查出站服务器名称 ( SMTP ) 是否正确。要检查或更改SMTP设置，请转到您的帐户^(Account)，单击服务器设置^{(Server Settings)}。

4] 垃圾邮件

如果您的收件箱已满，您将无法发送或接收任何电子邮件。删除不需要的电子邮件，清空垃圾邮件和垃圾箱以获得一些空间，然后尝试发送卡在发件箱^(Outbox)中的电子邮件。

5]每日限额

您可能已经用完了每日限额。Outlook限制每天发送 300 封电子邮件，每分钟 30 封，每封电子邮件最多 100 个收件人。这是为了避免电子邮件垃圾邮件。检查您是否已经达到限制，在这种情况下，请起草您的电子邮件并在第二天发送。

相关阅读^{(Related read)}：Outlook 中的电子邮件未在 Windows 10 中同步。

6]错误的电子邮件地址

这是一个非常基本的错误，也是一个非常常见的错误。检查您是否输入了收件人的电子邮件地址，即使是小逗号而不是点也不会让您的电子邮件消失。

7]修复Office应用程序

转到您的 PC设置 → 应用^{(SettingsàApps)}程序和功能^(Features)，然后在搜索栏中输入Office^{(Type Office)}。单击^(Click)Microsoft Office并转到“高级设置”选项卡。单击^(Click)修复^(Repair)并重新启动Outlook。这可能会解决您的问题，并且您可以发送卡在发件箱中的电子邮件。

8] Outlook的过时版本

如果上述修复均无济于事，请卸载Outlook应用并重新安装，您可能使用的是过时版本的Outlook。

上述修复可能会解决您的Outlook 错误 17884^{(Outlook Error 17884)}，您将能够再次发送电子邮件。如果它仍然不适合您，请告诉我们。

Outlook Error Code 17884, Unknown error has occurred in Outlook

Not able to send the email through Microѕoft Outlook? If your email is stuck in the Outbox with error code 17884, then this post iѕ for you. Outlook is one of the most popular email clients used worldwide and this error occurs when your Outlook account gets disconnected automatically and your sent emails get stuck in the Outbox. Even restarting the app doesn’t help here, the email remains stuck in the Outbox.

Unknown error has occurred in Outlook. Outlook Error Code 17884, Mail could not be sent.

Let’s check what causes this Outlook error code 17884 and how can we fix it.

Outlook Error Code 17884

There can be many different reasons for this error which include-

1. Bad connectivity
2. Large email attachments.
3. An issue with the Exchange server
4. Junk Emails
5. Daily Limit
6. Wrong E-Mail Address
7. Obsolete version of Outlook

Unknown error has occurred in Outlook

How to fix Outlook Error 17884

1] Bad Connectivity

The most common error is bad connectivity. Intermittent internet connect can automatically disconnect the Outlook account and your emails will get stuck in the Outbox. In such a case, check your internet connection, restart Outlook, and try sending the email again. Most of the time it works.

2] Large Attachments

An E-mail with large attachments might also not get through. With Outlook you can send an attachment of a maximum of 20 MBs and this is valid for all versions. Your email won’t be delivered if they exceed the allowed attachment limit and may get stuck in the Outbox showing the error 17884.

3] An issue with the Exchange server

Check if the outbound server name (SMTP) is correct. To check or change the SMTP settings, go to your Account, click on Server Settings.

4] Junk E-Mails

You won’t be able to send or receive any emails if your inbox is full. Delete the unwanted emails, empty the spam and trash box to get some space and try sending the email stuck in the Outbox.

5] Daily Limit

You might have run out of the daily limit. Outlook has a limit of sending 300 emails per day, 30 per minute, and up to 100 recipients per email. This is to avoid email spamming. Check if you have already reached the limit, in such a case, draft your email and send it the next day.

Related read: Email in Outlook not syncing in Windows 10.

6] Wrong eMail Address

This is a very basic mistake and a very common mistake. Check if you have put the recipient’s email address, even a small comma instead of a dot will not let your email go.

7] Repair Office apps

Go to your PC SettingsàApps & Features and Type Office in the search bar. Click on Microsoft Office and go to the ‘Advanced Settings’ tab. Click on Repair and restart Outlook. This might solve your problem and you may be able to send the emails stuck in your outbox.

8] Obsolete version of Outlook

If none of the above fixes help, uninstall the Outlook app and install it again, you might be using an obsolete version of Outlook.

The above-mentioned fixes will possibly solve your Outlook Error 17884 and you will be able to send the emails again. Do let us know if it’s still not working for you.

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