How do I fix SMTP authentication error?

The second option is to enable ‘Less secure apps’ within GMAIL.

  1. Log into your GMAIL account.
  2. Navigate to the ‘Less secure apps’ page.
  3. Toggle to turn this feature ‘ON’.
  4. Wait at least 1 hour for Google to update this setting.
  5. Test your mail application again. It should now send correctly via SMTP.

How do I fix server response was 5.7 0 authentication required?

If 2SV is not enabled, you must enable access for less secure apps: sign into the Gmail account using a web browser at https://mail.google.com, then go to All Settings > Accounts and Import > Other Google Account settings. Under Security, scroll down and enable access for less secure apps.

How do I fix Gmail SMTP not working?

Check SMTP settings, enable less secure apps, and unlock Captcha:

  1. Confirm the form’s SMTP settings are correct.
  2. Enable access to Less secure apps.
  3. Enter your username and password, then enter the letters on the screen.

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.

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.

What does 5.7 0 authentication required mean?

The server response was: 5.7. 0 Must issue a STARTTLS command first: This error means that the transport layer security (TLS) needs to be set to “Yes” in your SMTP settings. The SMTP server requires a secure connection or the client was not authenticated.

How do I find my Gmail SMTP credentials?

Fill out the required fields according to the instructions below:

  1. SMTP server: smtp.gmail.com.
  2. SMTP port: 587.
  3. Authentication required: Tick the checkbox.
  4. Secure connection (SSL/TLS) is required: Tick the checkbox.
  5. Sender name: Enter a name as you like.
  6. Sender email: Enter your Gmail address.