How do I fix Error 421 in Outlook?

A misspelled server name or a wrong port setting due to recent configuration in Outlook also may create error 421. It can be fixed by removing and then adding the account again. After removing the account, add it again.

Table of Contents

How do I fix Error 421?

How to Fix Error 421 Cannot Connect to SMTP Server?

Modify SMTP Settings. By default, the SMTP uses port 25.
Remove and Re-add Email Account.
Disable Firewall.
Check Other Applications.
Repair PST File to Fix 421 Cannot Connect to SMTP.

What does 421 service not available mean?

FTP error 421 service not available – A Quick Glance And, FTP error 421 service not available means that the connection to the remote server can’t be established. FTP clients such as Filezilla returns the error like this: 421 Service not available, remote server has closed connection.

What is error 421?

What Is a 421 Status Code? The request was directed at a server that is not able to produce a response. This can be sent by a server that is not configured to produce responses for the combination of scheme and authority that are included in the request URI.

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.

How do I fix a SMTP error?

How to fix issues with sending email (SMTP)

Open the settings for your email in the application or device you are using.
Locate the outgoing SMTP server and its settings.
Check the current outgoing port and change it to 26 or 587.
Make sure any username and password fields are filled in if shown.
Save changes and test.

What are the SMTP settings for Outlook com?

Outlook Smtp Settings

Server Address: smtp-mail.outlook.com.
Username: Your Outlook Email Address (e.g. [email protected])
Password: Your Outlook Password.
Port Number: 587 (With TLS)
Alternative Port Number: 25 (Without TLS/SSL)
Sending Limits: 300 Emails a day or 100 recepients a day.

Why is my SMTP server not sending emails?

Check whether there is network access from CSO to the SMTP server. Check whether the firewall is blocking SMTP traffic to SMTP server or whether the ports are blocked. If the server settings and authentication settings are correct, check whether the firewall is blocking port 587 and 465 and SMTP traffic.

How do I find out what my SMTP server is?

Android email app

Go to Settings > select the account you’d like to connect to Prowly > under Server settings you should see Outgoing mail and Incoming mail.
Tap on Outgoing mail to see SMTP settings, Incoming mail will give you IMAP settings.

What is SMTP server for Outlook 365?

The following are the incoming and outgoing IMAP server settings for Office 365….IMAP and SMTP with OAuth2 Server Settings.

Setting	IMAP (incoming)	SMTP (outgoing)
Server Name	outlook.office365.com	smtp.office365.com
Port Number	993	465 or 587