Lagos, Nigeria

FIX: Error 421 cannot connect to SMTP server in Outlook

Vlad Constantinescu
by Vlad Constantinescu

VPN Expert & Privacy Advocate

  • If you get the 421 cannot connect to SMTP server error, there are a few ways you can go about fixing it.
  • Although there are quite a few potential causes for this error, we’ll focus on the most common ones.
  • Check out our Outlook Hub to learn more about this Microsoft product.
  • Visit our Outlook Troubleshooting section for more fixes and easy-to-follow guides.

To fix various PC problems, we recommend Restoro PC Repair Tool:

This software will repair common computer errors, protect you from file loss, malware, hardware failure and optimize your PC for maximum performance. Fix PC issues and remove viruses now in 3 easy steps:
  1. Download Restoro PC Repair Tool that comes with Patented Technologies (patent available here).
  2. Click Start Scan to find Windows issues that could be causing PC problems.
  3. Click Repair All to fix issues affecting your computer’s security and performance
  • Restoro has been downloaded by 0 readers this month.

The server responded: 421 cannot connect to SMTP server error is basically associated with Microsoft Outlook accounts.

It occurs most often while trying to send an email message via the platform.

Although the most common cause is improper SMTP configuration, there are many other factors that could cause this error.

However, we’ll only focus on some of the most common ones, with emphasis on how to resolve the issue.

Read about our solutions in detail below.

How can I fix Error 421 cannot connect to SMTP server in Outlook?

This post was written by Vlad Constantinescu and was first posted to WindowsReport

Do you find this article helpful? Your Friend might too. So, please Share it with them using the Share button above.
Will you like to get notified when I post new updates? Then Follow me on any of my social media handles: Google News, Telegram, WhatsApp, Twitter, Facebook, Pinterest.
You can also drop your email address below if you wish to be notified by mail.

Tags: , ,

%d bloggers like this: