Share this article

Improve this guide

FIX: Outlook error 0x8004210A

Discover tried-and-true strategies vetted by our team of specialists

4 min. read

Updated onOctober 4, 2023

updated onOctober 4, 2023

Share this article

Improve this guide

Read our disclosure page to find out how can you help Windows Report sustain the editorial teamRead more

Key notes

Outlook error 0x8004210A can arise when users try to send or receive emails within the Outlook client application. The 0x8004210 error message states:

The operation timed out while waiting for a response from the receiving server.

The connection to your mail server timed out. Please check your mail settings.

As a consequence, users can’t receive or send emails. Do you need to fix that same issue? If so, check out these potential resolutions for error 0x8004210A.

How do I fix Outlook error 0x8004210A?

1. Uninstall third-party antivirus software

Error 0x8004210A orThe connection to your mail server timed out. Please check your mail settingscan be due to third-party antivirusfirewalls blocking Outlook.

If you prefer to keep your third-party antivirus utility, try disabling it first. You can usually do that by right-clicking the utility’s system tray icon and selecting a disable option of some kind.

However, deactivating the shield might not always be enough to disable the antivirus utility’s firewall (if it has one).

If you notice that your antivirus keeps interfering with other apps on your PC, we recommend switching to a different one.

Manythird-party antiviruses for Windows 10can offer full real-time protection without having a negative impact on your PC.

Please make sure to get security software with a strong firewall and multiple layers of protection. Another important thing to look for is a strong and transparent privacy policy.

2. Repair corrupted PST file

Some users might need to repair a corrupted PST file to fix error 0x8004210A.

You can also opt for a third-partyOutlook email recovery softwarethat will do the job much faster and without much work on your behalf.

These tools will help you fix your PST files and also recover any lost data such as attachments, contacts, calendars, and more.

Outlook recovery tools are for the most part compatible with all versions of the software. They support export in various formats for all recovered data.

3. Uninstall third-party firewalls

Some users might also have separate third-party firewalls. Software such asComodo Firewall, Glasswire, and ZoneAlarm are standalone packages that could block Outlook.

If you have software like that, uninstall it as outlined above. Alternatively, add Outlook to a third-party firewall’s software exclusion list.

4. Increase the server timeouts period

5. Set up a new Outlook user profile

Error 0x8004210A might not arise within a new Outlook profile.

Those are some of the confirmed resolutions for 0x8004210A. TheMicrosoft Support and Recovery Assistantmight also come in handy for fixing error 0x8004210A.

Check out theMicrosoft Support and Recovery Assistant pageto download it.

Let us know what solutions you used to solve this Outlook issue by leaving us your feedback in the comments section below.

FIX: Outlook error 0x8004210A#

How do I fix Outlook error 0x8004210A?#

1. Uninstall third-party antivirus software#

2. Repair corrupted PST file#

3. Uninstall third-party firewalls#

4. Increase the server timeouts period#

5. Set up a new Outlook user profile#