SMTP Error Could not authenticate [closed]

1. How do I fix SMTP error could not authenticate?
2. What is SMTP authentication failure?
3. How do you fix SMTP connect () failed?
4. What is SMTP Error 535 Authentication failed?
5. Can't connect to SMTP server?
6. How do I fix SMTP Error 535?
7. How do I enable SMTP authentication?
8. How do I authenticate SMTP?
9. How do I fix SMTP Error 554?
10. What is SMTP error?
11. Why does SMTP fail?

How do I fix SMTP error could not authenticate?

How to fix 'SMTP could not authenticate' error?

1. You might have entered the wrong email credentials. In most cases, the Email address and Username should be the same. ...
2. You might have the wrong SMTP settings. ...
3. Your email account has multi-factor authentication enabled: ...
4. The SMTP connection is disabled by your email service provider.

What is SMTP authentication failure?

If your mail server (also known as the SMTP server) rejects the user name and password, an Authentication Failed error will result. ... You will not be able to send any email until this problem is resolved, although it may not affect the ability to receive email.

How do you fix SMTP connect () failed?

How to fix SMTP Error: Failed to connect to server

1. Modify the firewall rules on the server to allow outbound connections on ports like 465.
2. Modify the SMTP restrictions on the server. ...
3. Edit PHPMailer settings like Host, Port etc.
4. Correct DNS resolution for mail server.

What is SMTP Error 535 Authentication failed?

A “Server says: 535 – Incorrect authentication data” error is usually related to the SMTP User Authentication details you have configured (or not configured) in your email settings. ... This error is often reported by mail users who maintain multiple mail devices, and forget to update login details in one of their devices.

Can't connect to SMTP server?

Most common reason for 'Outlook cannot connect to SMTP server' error is the wrong configuration settings of Outlook. ... A mis-spelled mail server name to a wrong port setting in Outlook can cause connectivity issues to the mail server and end up giving error while trying to send or receive mails.

How do I fix SMTP Error 535?

How to resolve this problem

1. Login to the control panel and check the status of your account to ensure it is not disabled for any reason - any issues would normally be highlighted for you.
2. Check you are using the correct username and password.

How do I enable SMTP authentication?

Enable SMTP AUTH for specific mailboxes

1. Open the Microsoft 365 admin center and go to Users > Active users.
2. Select the user, and in the flyout that appears, click Mail.
3. In the Email apps section, click Manage email apps.
4. Verify the Authenticated SMTP setting: unchecked = disabled, checked = enabled.

How do I authenticate SMTP?

How to configure SMTP authentication

1. Right-click on the context menu of your e-mail account and click on “Settings”
2. Navigate to “Outgoing server (SMTP)” select your mail server and click “Edit”
3. Activate the option “Use username and password” and enter your e-mail address.
4. Confirm the settings with “OK”

How do I fix SMTP Error 554?

How to fix SMTP Error 554

1. Check your server's IP for any possible blacklisting.
2. If not blacklisted, request your IP be whitelisted by the receiving server.

What is SMTP error?

An SMTP response code is a three digit code that the servers use to communicate throughout the email sending process. ... If there is a communication error, you will receive an SMTP error code — a message that indicates the specific problem; like the end of server communication which is error code 550 (The request failed).

Why does SMTP fail?

Possible Problem 3: Getting SMTP Connection Failure on a Shared Hosting Provider. SMTP connect() failed. then, this is mostly because of the firewall rules on their infrastructure that explicitly blocks the outgoing SMTP connection to ports 25, 587, and 465 to all external servers.