This is one of the commonly occurred error faced by users while trying to send emails using Outlook Express. This is mostly because of wrong Outlook settings or blocked port 25.
This error can occur because of a very common mistake of leaving “My SMTP server requires authentication” checkbox unchecked. Below mentioned is the procedure to enable SMTP authentication for your Outlook Express mail client:
Select Accounts from the Tools Menu, the internet accounts box appears. Now you need to select the Mail Tab, which will make your email account appear. You need to select the email account by clicking on it and also click the properties button on the right. In the Outlook Mail Server section you need to check the box “My Server requires authentication”. Please make sure you don’t check the box next to Log on using Secure Password Authentication.
Please use the Correct Mail Client settings stated below:
- Incoming mail server (POP3/IMAP server): mail.yourdomain.com
- Outgoing mail server (SMTP server): mail.yourdomain.com
- Username: the full e-mail address like email@yourdomain.com
- SMTP authentication must be enabled for the login to be successful.
Check connection to port 25
For SMTP connection the standard port used is port 25. In most of the cases the ISP (Internet Service Provider) blocks port 25. If you are facing a similar kind of problem, we recommend you to use an alternative port 2525 for your mail SMTP connection.
If you are still facing issues with sending emails using Outlook Express, we recommend you to contact your Web Hosting Service Provider for further assistance.