Our servers require you to log in in order to make use of SMTP e-mail sending. If we did not require users to log in to send e-mails, anyone could use the server to send spam.
Usually, when this error occurs, it means you did not tick the checkbox "My outgoing server (SMTP) requires authentication". Please follow the steps below to enable it on your e-mail client:
Microsoft Outlook
- Click on Tools
- Click on E-mail Accounts
- Select "View or change existing e-mail accounts"
- Click "Next"
- Select your Email account and click "Change"
- Click "More settings"
- Click on the "Outgoing Server" tab
- Check the checkbox next to "My outgoing server (SMTP) requires authentication"
- Select "Use same settings as my incoming email server"
- Click Ok, Next, and then Finish.
Thunderbird
- Click on Tools
- Click on Account Settings
- Now click on Outgoing Server (SMTP) at the bottom of the list on the left side of the window.
- Select the appropriate outgoing server
- Click on Edit.
- Make sure "Authentication method" is set to "Normal password"
- Click OK to close the SMTP edit window and again on the Account Settings window.
Mac Mail
- Click on Mail
- Click on Preferences
- Click on Accounts
- Where it says Outgoing Mail Server (SMTP), click the drop-down arrow and select "Edit SMTP Server List"
- Click the Advanced button and make sure Authentication is set to "Password".
- Click OK to close the edit window