How do I fix SMTP Error 421?

How to Fix Error 421 Cannot Connect to SMTP Server?

Table of Contents

Send/Receive Groups window.
Changing port numbers in Internet Email Settings window.
Enabling “Use the same settings as my incoming mail server” option.
Recreating Outlook account.
Turning Off Firewall in Windows Settings.
PST selection window in Stellar Repair for Outlook.

Can not connect to SMT?

If you recently configured your email account in Outlook, chances are the error is caused by a configuration mistake. Keep in mind that a misspelled mail server name or the wrong port setting will cause Outlook to show the “421 cannot connect to SMT/ SMTP server” error when sending or receiving an email.

How do I fix an SMTP error with Outlook?

Fix SMTP Server error in Email

Open your email client program (Outlook Express, Outlook, Eudora or Windows Mail)
Click “Accounts” in the “Tools” menu.
Click on your email account then click “Properties” button.
Click “General” tab.
Ensure that the “E-mail address” is your valid address for this account.
Click “Servers” tab.

Can’t connect to SMTP?

1 SMTP Status appears when no answer is received from the host or when the connection is lost. This could be due to a temporary issue with their network or mail server or due to a configuration within your middleware (firewall, antivirus, etc.) blocking the connectivity.

Can’t connect to Outlook SMTP host?

Possible Solution: Please verify that you have enabled “My SMTP Requires Authentication” in Incoming mail server Outlook settings. If this does not work out, then try to disable the firewall of your local machine from where you are trying to send out an email.

How do I know what my SMTP server is?

In Outlook, click File. Then navigate to Account Settings > Account Settings. On the Email tab, double-click on the account you want to connect to HubSpot. Below Server Information, you can find your incoming mail server (IMAP) and outgoing mail server (SMTP) names.

What does it mean unable to connect to server?

This error means your device cannot connect to your provider’s mail server. It can be anything from no network, intermittent or unstable network, or even a good internet connection in general but inability to reach your specific provider’s mail server.