The most common reasons for not being able to send emails through Outlook are wrong Outlook settings or blocked port 25 by the Internet Service provider.

Here are a few checks you can make to ensure the problem is not on your end:

Use the correct Mail Client settings:

• 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.
  IMPORTANT: Please do not use secure authentication to your mail server.

The most common mistake is to leave My SMTP server requires authentication checkbox unchecked. This option should always be enabled since most mail servers require such authentication.

In our Email tutorial you can find detailed instructions on how to configure your Outlook to work with your web hosting account.

Check connection to port 25

The standard port used for SMTP connection is port 25. Most often the reason for failed email sending is that your Internet service provider blocks this port. If this is the case we recommend that you use the alternative port 2525 for your email SMTP connection.

If you are having problems with your email, you may ask your host for assistance. SiteGround provides the best email hosting and we will assist you with any email sending issues you may have.