Share this article

Improve this guide

What is the SMTP Authentication Error & 3 Ways to Fix it

5 min. read

Updated onOctober 4, 2023

updated onOctober 4, 2023

Share this article

Improve this guide

Read our disclosure page to find out how can you help Windows Report sustain the editorial teamRead more

Key notes

SMTP or Simple Mail Transfer Protocol could be understood as a set of communication guidelines that allow the software to transmit an electronic mail over the Internet.

An SMTP server will have an email address set by the mail client or application. Generally, the SMTP email server address can be found in your mail client’s account or settings section.

But recently, many users have had trouble connecting their email accounts through the SMTP method. While trying to do so, they have encountered an SMTP authentication error.

If you’re also facing this issue, keep reading to know how you can fix it.

What is the use of SMTP authentication?

Using an SMTP client, users can log in using any authentication mechanism supported by the server. Mainly, submission servers use this as authentication is mandatory to access the data.

SMTP authentication is a method by which ISP users identify themselves to the email server to send the mail. No person can send email via any mail server they choose; mail servers will only allow the sending of email by authorized users.

Do I need SMTP authentication?

Nowadays, privacy is a primary concern people consider. Everyone using an email server aims to stay anonymous, and SMTP authentication does that.

If you don’t use SMTP authentication, it’s possible that a potential hacker can spoof you. They can access your email server, send unauthorized sales emails, and request personal information from the recipient for identity theft.

How do I authenticate my SMTP server?

How do I fix SMTP authentication error?

1. Check your email credentials

The SMTP authentication error 535 can occur if the user has entered the wrong login credentials on their email service providers portal. Usually, people use the same username and password as their email address to log in to their email server.

But some SMTP servers ask for a different set of credentials than the email account. To resolve this, enter the correct login credentials or try resetting your password.

2. Check if your account is disabled

Issues like spamming and payment dues can sometimes disable your account. A disabled account could be the reason why an SMTP authentication error occurs.

As a result, you should verify the status of your account to confirm if it is active. If you encounter any problems, please contact your server support staff.

3. Check if the SMTP connection is disabled by your email service provider

This can happen very rarely but sometimes service providers candisable the SMTP connectiondue to some errors in the server. In this case, try reaching out to your email service provider to re-enable SMTP authentication.

On what platforms can the SMTP authentication error occur and how to fix them?

Below is a list of all the platforms where the SMTP authentication error scan to email occurs and methods to fix them:

This was how you can fix the SMTP authentication error while logging into your email service provider.

If the troubleshooting methods didn’t solve this error, this could be aSMTP Port problem. Rest assured our guide can help you fix it.

If you still have any issues, feel free to drop a comment below. We’re eager to hear from you.

What is the SMTP Authentication Error & 3 Ways to Fix it#

What is the use of SMTP authentication?#

Do I need SMTP authentication?#

How do I authenticate my SMTP server?#

How do I fix SMTP authentication error?#

1. Check your email credentials#

2. Check if your account is disabled#

3. Check if the SMTP connection is disabled by your email service provider#

On what platforms can the SMTP authentication error occur and how to fix them?#