
Outlook email sleeping refers to an issue where emails received while a computer is in sleep mode are missing from the Outlook interface upon resuming. This problem has been observed with Outlook 2013, where emails received during the period the computer was in sleep mode are not visible in the inbox, although they can be found through a search in Outlook. This issue has prompted discussions and troubleshooting suggestions, with some suggesting that restarting Outlook or ensuring it remains online can help resolve the problem of missing emails while the computer sleeps.
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What You'll Learn

Emails not appearing in Outlook inbox after sleep mode
If you are using Outlook 2013, you may encounter an issue where emails received while your computer is in sleep mode do not appear in your inbox when you resume. Specifically, this issue affects emails received between the time the computer entered sleep mode and the time it was restarted. While these emails can be found by performing a search in Outlook, they do not appear in the inbox and are marked as "unread".
This issue can be resolved by restarting Outlook, which will make the missing emails reappear in the inbox with the "unread" flag. It is worth noting that messages received after the machine has been resumed are displayed correctly.
In some cases, the problem may be related to the internet connection type. Outlook may not function properly with a wired connection and switching to a wireless connection may resolve the issue.
Additionally, it is important to check for any antivirus or firewall settings that could potentially block you from receiving emails. Ensuring your internet connection is stable and checking for any updates or changes to your email settings can also help resolve email retrieval issues in Outlook.
If the problem persists, it may be beneficial to seek further technical support or refer to specific error messages or behaviour of your Outlook application to identify a solution.
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Emails sent successfully while in sleep mode
When your computer is in sleep mode, it stops most of its functions, including receiving emails. However, this does not mean that you cannot send emails while your device is asleep. If you send an email while your computer is in sleep mode, it will be sent successfully once your device connects to the internet. The email will remain in your outbox until your computer wakes up and establishes an internet connection. At that point, the email will be transmitted to the recipient's inbox as usual.
It is important to note that sleep mode is different from hibernation. In sleep mode, your computer still consumes a small amount of power to maintain its current state in RAM. This allows for a quick wake-up process and immediate access to your work. On the other hand, hibernation saves the current state of your computer to the hard disk and then powers down completely. When you wake up a device from hibernation, it takes longer because the computer needs to reload everything from the hard disk.
While sleep mode is convenient for quickly resuming work, it may not be the most eco-friendly option if you plan to keep your computer asleep for extended periods. In such cases, hibernation or shutting down the computer completely may be more power-efficient choices.
If you need to receive emails promptly, it is recommended to keep your computer active or, at the very least, wake it up periodically to check for new messages. Emails sent while your computer is asleep will remain in your outbox until the device connects to the internet and transmits them.
In summary, while your computer is in sleep mode, emails you send will be temporarily stored in your outbox. Once your device wakes up and connects to the internet, these emails will be successfully transmitted to the recipients. However, incoming emails will not reach you until you exit sleep mode and check for new messages. Proper management of sleep mode, along with periodic wake-up intervals, can help ensure timely communication without sacrificing power efficiency.
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Outlook 2013 client issues with hibernation
Outlook email "sleeping" usually refers to issues with Outlook connectivity after a computer wakes up from hibernation or sleep mode. Outlook 2013 clients, in particular, have experienced problems with hibernation, where emails are lost or deleted from the outbox or sent folder. This issue is not limited to Outlook 2013, as similar problems have been reported for Outlook 2016 as well.
In one case, a user reported that they often use hibernation mode when leaving the office. However, when they resumed their machine from hibernation, they encountered an issue where emails were missing from their outbox and sent folders. This problem is specific to the hibernation mode, as the user did not face any problems when shutting down or restarting their computer.
Another user reported a similar issue with Outlook 2016, where they were unable to connect to Exchange Online after resuming from hibernation. They stated that everything worked fine except for the Outlook connection issue.
These issues highlight the potential problems that can occur when using hibernation mode with Outlook. It appears that the Outlook application may have difficulty synchronizing or reconnecting to the mail server after the computer wakes up from hibernation. This can result in lost or delayed emails, as well as connectivity errors.
To troubleshoot these issues, users can try restarting Outlook after resuming from hibernation, as this has been reported to resolve the connection problem in some cases. Additionally, checking DNS settings, autodiscover settings, Outlook Anywhere configuration, virtual directories, and internal/external URIs can help identify any potential configuration issues that may be causing the problem.
It is important for Outlook users who frequently use hibernation mode to be aware of these potential issues and take the necessary steps to mitigate them. Regularly backing up emails and verifying email status after resuming from hibernation can help ensure that important emails are not lost or delayed due to hibernation-related problems.
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Delayed emails and sleep mode
If you're using Outlook and your computer goes into sleep mode, your emails may not send as expected. Outlook cannot wake a machine up from sleep mode to send an email, and the email will remain in your outbox until the next scheduled send/receive.
To ensure your emails send on time, make sure your Outlook client is configured for online mode and not cached. This way, even if you power off your machine, the email will still send at the scheduled time. However, if your Outlook is offline, or if you are logged out, your delayed email will not send.
It's important to note that this only applies if you are purposefully delaying the mail. If you are using Exchange, the email will send immediately unless you have scheduled a delay. On the other hand, if you are using IMAP/POP, it will send during the next scheduled send/receive.
If you need to send the email before the next scheduled send/receive, you can do a manual send/receive. Additionally, it may be worth checking if there is a setting in your BIOS that can wake the machine up to send delayed emails. Alternatively, you can simply leave your machine on.
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Outlook email issues: troubleshooting
Troubleshooting Outlook email issues can be a frustrating experience. Here are some common problems and potential solutions to help you get your Outlook email working again.
Unable to Send or Receive Emails
If you are unable to send or receive emails, there could be a few reasons. Firstly, check if Outlook is experiencing server issues or outages. You can do this by visiting the official Microsoft Service Health portal or checking on third-party downtime tracking websites. If there are no reported issues, the problem could be specific to your account. Check if your account has been temporarily blocked due to unusual sign-in activity and learn how to unblock it. Another reason could be that your email has an attachment larger than 25 MB, which Outlook cannot send. Remove the attachment or reduce its size and try sending again.
Sync Issues
Sync issues are common, especially when using Outlook across multiple devices. If you are having sync issues, try removing the partnership between the mobile device and your mailbox. You can also try updating your password if it has been changed recently, as this can cause sync problems. Additionally, make sure that you have enabled the "Sync my device contacts" toggle in your settings.
Error Messages and Missing Features
Sometimes, you may encounter error messages like "Your message can't be displayed right now." This could be due to a temporary glitch, and simply clicking once on the email to keep the Inbox displayed can help you go back and try again. Another issue could be missing navigation arrows to move between emails. This is a known issue that Microsoft is working to fix.
Issues with Attachments and Signatures
If you are having trouble attaching files, ensure that the size of the attachment is within the allowed limit. Also, check if your signature is causing the problem by removing it and then resending the email.
Remember to keep your Outlook app updated and check Microsoft's official support pages for known issues and their fixes.
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Frequently asked questions
Outlook email sleeping means that your computer was put in sleep or hibernation mode while your Outlook client was still open.
No, Outlook will not send a delayed email if it is offline, the user is logged out, or the machine is asleep.
No, Outlook cannot wake a machine up from sleep mode to send an email. If you are using IMAP/POP, the email will sit in your outbox until the next scheduled send/receive.
Emails received while Outlook is sleeping will not appear in your inbox when you resume, but they can be found by searching for them in Outlook.
To prevent Outlook from sleeping, simply leave your machine on. Alternatively, check if there is something in the BIOS that can wake the machine up.




























