Reasons why emails cannot be sent in Outlook and remain in the outbox and how to deal with them

Email is an essential tool for modern business communication, and Outlook in particular is used by many users due to its rich functionality and convenience. However, while technology continues to evolve, various problems also occur. One of them is the problem of not being able to send emails and leaving them in the outbox. What should we do when faced with this?

Here are some solutions if you can't send emails in Outlook and the outbox remains.

  • Restart your computer and Outlook
  • Check your internet connection
  • Check if Outlook is offline
  • Check if the attachment is too large
  • Organize your outbox
  • Update Outlook

And so on.

Specific methods for solving these problems are also written, so please refer to this article and solve them.

 Overview of issues when emails are not delayed or remain in the outbox in Outlook

In conclusion, if you can't send an email in Outlook or it stays in your outbox, it's usually due to problems with your network connection, email server settings, or email software. Many of these problems can be solved with surprisingly simple operations.

For example, common reasons why emails remain in your outbox include an unstable internet connection or a misconfigured email server. Specifically, you may be trying to send an email from a location with a weak Wi-Fi signal, or you may have entered the wrong email server port number.

Ultimately, by being aware of these issues and taking appropriate action, email sending issues in Outlook can be resolved.

 Main reasons why emails cannot be sent in Outlook and remain in the outbox

The main reasons why emails cannot be sent in Outlook and remain in the outbox include incorrect email server settings, large attachments, software glitches, and network connection issues.

For example, if your email server is configured incorrectly, emails will not be sent correctly and will remain in your outbox. This is caused by an incorrect SMTP server name or port number. Also, if the email contains a large attachment that exceeds the server limit, the email cannot be sent.

Software glitches and network connectivity issues can also prevent email sending. This includes failure to update Outlook, bugs, unstable Wi-Fi, and intermittent internet connections.

Therefore, if you encounter a problem where you cannot send emails, you should check each of these causes one by one and resolve them. In the next section, we will explain a specific solution.

Specific solutions when unable to send email in Outlook

Start with a restart: Refresh your PC and Outlook

The first solution you should try is a reboot. Refreshing your computer and Outlook itself is the first step towards resolving the issue of not being able to send.

The reason is that restarting can resolve various problems that occur while operating your PC or Outlook, such as temporary software errors, processor overload, and insufficient memory. This may resolve Outlook sending errors.

Specifically, first restart the entire computer. After that, open Outlook and try sending the email again. If you still can't send, it may be worth trying restarting Outlook, such as completely closing and reopening Outlook.

Therefore, if you are having trouble sending emails in Outlook, we recommend that you start by restarting your computer and Outlook. This is often a surprisingly effective measure.

Check your internet connection: rule out network issues

Checking your internet connection is essential when you face email sending problems in Outlook. This allows you to verify network-related issues and determine the cause.

This is because Outlook is a service that requires an Internet connection, and problems with sending emails may occur due to unstable or disconnected connections. Additionally, the same applies if your Wi-Fi signal is weak or there are issues with your router.

For example, if you can't send emails in Outlook, first open your browser and check if the website displays properly. If the problem persists, try restarting your Wi-Fi or router, or trying a wired connection.

In conclusion, when you encounter email sending errors, it is important to first check your internet connection and rule out network issues. This will help you isolate the problem and find a way to solve it.

Check and fix offline status: Ensure online connectivity

Checking and fixing offline mode is an important step when you encounter email sending issues in Outlook. This fulfills the basic requirement of ensuring online connectivity.

That's because if Outlook is incorrectly set to offline mode, you will not be able to send or receive emails even if you are connected to the Internet. This is a common situation when the device is unintentionally placed in offline mode due to an incorrect operation or software glitch.

Specifically, check "Work Offline" on the "Send/Receive" tab. If the button is selected and the background is bright, it indicates offline mode. Click this and wait until dark to return to online mode.

Finally, when you encounter a problem that prevents you from sending emails, checking and fixing offline mode is a basic and important workaround. This ensures that you have the necessary online connectivity and can help you resolve your issue.

Attachment file size verification: Check if data capacity is the cause

If you are unable to send emails in Outlook, one of the reasons may be that the attachment size is too large. Therefore, it is very important to check the size of the attachment and verify that it does not exceed the sending limit as part of resolving the issue.

Many email services place limits on the amount of data that can be sent at one time. If you try to send a large attachment using Outlook, the email may get stuck in your outbox and you won't be able to send it.

For example, an employee at one company encountered an email issue when attempting to attach a presentation containing a large amount of data. To find out the cause of the problem, he checked the size of the attachment and found it was over 25MB. This size exceeded the limits of many email providers. After compressing the file and reducing its size, he was able to successfully send the email.

In conclusion, checking the size of the attachment and verifying whether it exceeds the sending limit is an important solution when dealing with the issue of not being able to send emails in Outlook.

If you need to send a large file, try sending it in parts, compressing it with compression software, or downloading it from an online storage.

Cleaning your outbox: Identifying and deleting problem emails

An effective way to resolve the problem of emails remaining in the Outlook outbox is to organize the outbox. Unable to send issues can often be resolved by identifying the offending email and deleting the email if necessary.

If there are emails stuck in the outbox, new emails will be blocked from being sent, making normal email exchange difficult. This is especially true if your outbox is full of undeliverable emails.

For example, a user might try to send a large number of emails with multiple attachments, but they get stuck in the outbox. When the user checked their outbox and deleted the offending email, subsequent emails were sent smoothly.

Therefore, organizing your outbox is an important step to resolve the issue of not being able to send emails in Outlook. Identifying and deleting the offending email may help the sending process go more smoothly.

Update Outlook: Update to the latest version

One of the effective ways to resolve Outlook email sending problems is to update Outlook to the latest version. Software updates are the primary means of fixing issues and delivering new features during production, and Outlook is no exception.

Older versions of Outlook may have problems sending emails due to compatibility issues or bugs. Compatibility issues can sometimes occur, especially when newer operating systems interact with older versions of Outlook.

For example, a user was using Outlook 2013 on Windows 10 and experienced an issue where some emails remained in the outbox. However, when I updated Outlook to the latest version, the problem was resolved.

Therefore, if you are facing the problem of Outlook not being able to send emails or remaining in the outbox, we recommend checking for Outlook updates. This is an effective way to eliminate software bugs and compatibility issues and ensure that you can send and receive email normally.

Check and correct advanced settings: Optimize sending settings

In order to resolve email sending problems in Outlook, it is necessary to check and correct the advanced settings, that is, to optimize the sending settings. Improper settings can cause email sending issues.

Outlook's email sending settings are important factors that are directly related to the success of email sending, such as the connection method to the email server, port number, and security protocols. If these are not set correctly, emails may get stuck in your outbox.

For example, one user experienced an issue where emails were stuck in the outbox due to incorrect SMTP server settings for sending emails. The problem was resolved by resetting the SMTP server address and port number correctly.

Therefore, if you are facing the issue of emails not being sent or remaining in the outbox in Outlook, we recommend checking and fixing the advanced settings first. This increases your chances of having accurate settings and resolving email sending issues.

Check mailbox capacity: prevent over capacity

In order to resolve email sending problems in Outlook, it is important to check the capacity of your mailbox and prevent it from exceeding its capacity. This is because when your mailbox is full, new emails may be blocked from being sent and remain in your outbox.

Mailbox capacity varies depending on the number of sent and received emails and the size of attachments. If these items accumulate and exceed the capacity of your mailbox, you may not be able to send or receive emails properly.

In one specific example, a user had a large number of important emails and large attachments that filled their mailbox and prevented them from sending new emails. This issue was resolved by deleting unnecessary emails and attachments to free up space in the mailbox.

Therefore, if you are facing the issue of not being able to send emails or being stuck in the outbox in Outlook, it is recommended to check the capacity of your mailbox and free up space if necessary. This can effectively eliminate email sending problems.

 Adjust Cached Exchange Mode: Consider turning it off

When you encounter trouble sending emails in Outlook, there are cases where it may be helpful to consider turning off cached Exchange mode. The reason is that with Cached Exchange Mode enabled, data synchronization issues between the server and local PC are likely to occur, which may cause email sending issues.

For example, some users experienced issues with emails remaining in their outbox. They checked their Outlook settings and discovered that Cached Exchange Mode was enabled. After disabling this mode, the email was sent smoothly and the issue was resolved.

Therefore, if you encounter trouble sending emails in Outlook, please check the Cached Exchange Mode settings and consider disabling it if necessary. This increases your chances of resolving your email sending issues.

Creating a new profile: Resolving profile issues

If you are having trouble sending emails in Outlook, creating a new profile may be a good solution. The reason is that a corrupted old profile may cause sending problems.

For example, certain users faced repeated submission errors. After creating a new profile and sending emails from that profile, the issue went away. It may have been caused by some settings or data in your old profile.

Therefore, if you are facing the issue of not being able to send emails in Outlook, please consider that your existing profile may be causing the issue and try creating a new one. This may solve the problem.

 Creating a new OST file: Solving data file issues

When you face the problem of not being able to send emails in Outlook, creating a new OST file is a technique that may solve this difficulty. This is because the existing OST file may be corrupted or have some issues that may contribute to the transmission failure.

As a concrete example, a user was having trouble sending an email, which turned out to be due to a bug in the existing OST file. I created a new OST file and used that file to send emails and the problem went away.

Therefore, when you encounter an email sending problem in Outlook, please consider the possibility that there is a problem with the existing OST file and try creating a new OST file. This may resolve the issue.

Performing an Outlook repair: Repairing defects in the software itself

If you are having problems sending emails in Outlook, you may be able to resolve the issue by using Outlook's repair function. This feature is useful because if there is a problem with the software itself, it can be fixed.

For example, one user encountered a problem where emails frequently failed to send. At that time, he used Outlook's repair feature, which fixed the defect in the software itself and eliminated the previous issue.

Therefore, if you are having trouble sending emails in Outlook, you may want to consider performing an Outlook repair. Hopefully this will resolve the issue with the software itself and allow you to send emails again.

Unable to send to a specific address: Causes and solutions

If you are unable to send email to a specific address, this may be due to an incorrect destination address, registration on a block list, or sending restrictions. These problems are caused by Outlook settings and the status of the destination, so the solution lies in reviewing the settings and communicating with the destination.

For example, imagine sending an email to a valid email address over and over again, only to receive a "unable to send" notification. If the problem was caused by a typo in the email address, correcting it will resolve the issue. Additionally, if that email address is registered on your block list, or if the amount of email you can send exceeds the amount you can send, you will need to remove it from the block list or adjust the amount of emails sent.

Therefore, if you are unable to send email to a specific address, it is important to first identify the cause and take countermeasures. This will allow you to resume sending emails smoothly.

Deeper analysis of Outlook email unsendability issue

When dealing with problems with Outlook not being able to send emails, you need to consider not only superficial factors but also deep factors. The reason is that this problem is complex and multifaceted, involving multiple factors.

For example, various factors can affect this issue, including server settings, security software, and even OS and hardware issues. When you are having trouble sending emails, it may be caused by something that at first glance seems to be completely unrelated. Additionally, these problems are not isolated but often involve a combination of multiple issues, so it is necessary to analyze and resolve each element one by one.

Therefore, it is necessary to have a deeper analysis and a holistic perspective in order to resolve Outlook email not sending issue. By understanding how each element combines to cause a problem and responding to each, you will be able to get closer to solving the problem.

Best practices for using Outlook to prevent email sending problems

In conclusion, the best way to avoid trouble sending emails in Outlook is to properly manage your email settings and update them regularly. The main reasons why this issue occurs include poor connectivity with the server, incorrect SMTP settings, and using an outdated version of Outlook.

As a concrete example, let's say a user is facing an issue where emails remain in the outbox. At that time, it turned out that the SMTP settings were incorrect. By entering the correct SMTP server address and port, the issue was resolved and I was able to send emails successfully.

In conclusion, to prevent email sending problems in Outlook, it is necessary to configure the settings properly and update them regularly. In this way, maintain smooth communication and ensure trouble-free email sending.

Summary: The problem of not being able to send emails in Outlook can be overcome

In this article, we have explained in detail the causes and solutions for the problem that emails cannot be sent in Outlook and remain in the outbox. The main causes include poor connection to the server, incorrect SMTP settings, and an outdated version of Outlook. As a workaround, proper management of settings and regular updates are recommended. When using Outlook, understand these issues and respond appropriately to maintain smooth communication.

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