This article will explain why you can't use the 123-reg SMTP server
The below instructions will show you how to upgrade your old pophost mailbox to the new mailboxes, allowing you to use the SMTP server
To use our new outgoing mailserver, you must upgrade your (old) popbox to a new 123-reg mailbox.
If you purchased an email account with 123-reg prior to 6th July 2009 then you will have an old pophost.123-reg.co.uk account.
To upgrade your existing POP3 box to one of our new Mailboxes, please do the following:
Go to your 123-reg control panel.
Scroll down to the Email section and click on the Manage email option.
Find the mailbox that you wish to upgrade under the Your email addresses section by selecting the relevant domain name from the drop down box and clicking on the manage button.
Click on the Upgrade your Pophost to a Mailbox link.
Click on the Proceed button.
Your log on username will be changed to your email address. You can use this username to log in on our Webmail Service or you can use these settings to add a mail account in your mail client such as Outlook Express, or Entourage and etc.
The Mail server settings are as follows;
Incoming mail server:
Outgoing mail server:
Please note: If you are using 123-reg's SMTP server to send outgoing email, SMTP authentication must be turned on in your email client. You will need to edit the settings for your email account in your email client to turn this feature on.
If you are asked for a username and password, please use your mailbox username and password.