- 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.
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.
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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
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