出口に貼り付けられた電子メール：Outlook365でこれを解決する方法

Check your internet connection to ensure Outlook can communicate with the SMTP server. 2. Restart Outlook and your computer to resolve temporary glitches. 3. Remove large or corrupted attachments that may block sending. 4. Verify correct SMTP settings, including port 587 and TLS encryption. 5. Disable third-party add-ins that might interfere with sending. 6. Repair the Outlook data file using SCANPST.EXE to fix corruption. 7. Create a new Outlook profile if the current one is corrupted. 8. Install pending updates to resolve potential bugs. 9. Check for server-side outages via your email provider’s service health page. Finally, press Ctrl + Shift + F9 to manually force Send/Receive, and if issues persist, contact IT or Microsoft 365 support for further assistance.

Emails getting stuck in the Outbox in Outlook 365 is a common issue that can disrupt your workflow. When an email remains in the Outbox and won’t send, it usually means Outlook can’t communicate with the outgoing (SMTP) server. The good news is that most causes are fixable with a few straightforward steps.

Here’s how to resolve emails stuck in the Outbox in Outlook 365:

1. Check Your Internet Connection

Before diving into complex fixes, confirm you’re connected to the internet.

• Try loading a website in your browser.
• If you're on Wi-Fi, ensure the signal is strong.
• Restart your router if needed.

Outlook needs an active internet connection to send emails. If it’s offline, messages will stay in the Outbox until connectivity is restored.

2. Restart Outlook and Your Computer

Sometimes, a simple restart can resolve temporary glitches.

• Close Outlook completely (check Task Manager to make sure no Outlook processes are running).
• Reopen Outlook and wait a few moments for it to reconnect to the server.

If the email still won’t send, try restarting your computer. This clears temporary system issues that might be affecting Outlook.

3. Check for Large Attachments or Corrupted Files

Large attachments or corrupted files can prevent an email from sending.

• Open the stuck email from the Outbox.
• Look for unusually large files (e.g., videos, large ZIPs).
• Remove or compress attachments and try sending again.
• Alternatively, use OneDrive or SharePoint links instead of direct attachments.

Also, check if the message body contains problematic formatting or embedded content that might be causing issues.

4. Verify Account Settings and Server Configuration

Incorrect SMTP settings can block outgoing emails.

To check your settings:

1. Go to File > Account Settings > Account Settings.
2. Select your email account and click Change.
3. Click More Settings > Outgoing Server (SMTP).
   • Ensure the correct port is used (usually 587 for TLS/STARTTLS).
   • Confirm the encryption method matches your provider’s requirements (e.g., TLS or SSL).
4. On the Advanced tab, verify:
   • Outgoing server (SMTP): 587 (recommended)
   • Encryption: STARTTLS or TLS
   • Incoming server (IMAP/POP): 993 (IMAP) or 995 (POP), with SSL/TLS

If unsure, contact your email provider for correct settings.

5. Disable Add-ins Temporarily

Third-party add-ins can interfere with Outlook’s sending function.

To disable add-ins:

1. Go to File > Options > Add-ins.
2. At the bottom, select COM Add-ins from the dropdown and click Go.
3. Uncheck all add-ins and click OK.
4. Restart Outlook and see if the email sends.

If it works, re-enable add-ins one by one to identify the culprit.

6. Repair the Outlook Data File

A corrupted Outlook profile or data file can cause sending issues.

Use the Inbox Repair Tool (SCANPST.EXE):

1. Close Outlook.
2. Search for SCANPST.EXE on your computer (usually in C:\Program Files\Microsoft Office\root\OfficeXX).
3. Run the tool and select your Outlook data file (.pst or .ost).
4. Click Start to scan and repair.

After repair, restart Outlook and check the Outbox.

7. Create a New Outlook Profile

A corrupted profile is a common cause of persistent Outbox issues.

To create a new profile:

1. Go to Control Panel > Mail (Microsoft Outlook).
2. Click Show Profiles.
3. Click Add, name the new profile, and re-enter your email account details.
4. Set it as default and restart Outlook.

If emails send from the new profile, the old one was likely corrupted.

8. Check for Pending Updates

Outdated versions of Outlook may have bugs affecting email delivery.

• Open Outlook, go to File > Office Account > Update Options > Update Now.
• Install any available updates and restart Outlook.

9. Look for Server-Side Issues

Sometimes the problem isn’t on your end.

• Check your email provider’s service status page (e.g., Microsoft 365 Service Health).
• See if others are reporting sending issues.
• Wait and retry later if there’s an outage.

Final Tip: Manually Force Send/Receive

Press Ctrl + Shift + F9 to manually trigger the Send/Receive process. This can sometimes kickstart stuck emails.

If none of these steps work, consider contacting your IT support or Microsoft 365 support for deeper troubleshooting.

Basically, emails stuck in the Outbox are usually due to connectivity, configuration, or corruption issues—all of which are fixable with methodical checks.

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