550: Please try again later
Error 550 usually define a non-existent email address on the remote side (at the receiving end).
The vast majority of Error 550 messages are simply telling you that the recipient's email address doesn't exist.
Check you are using the correct email address.
It could instead be the case that their server is down.
Try sending again at a different time.
550: Please turn authentication on
550: Relay not permitted
If you try to send an email and see this error message, it means that your email client is not configured to authenticate with our outgoing mail servers.
When your email client settings are changed (see below) you will stop receiving the error message and you should be able to send mail.
In our experience, it is users of the Outlook email client who usually experience this kind of error.
Outlook users should follow the steps below to resolve this problem.
This guidance may also enable non-Outlook users.
If the email client are using is Outlook then please check that the following email account settings are as indicated below:
- Select More Settings in the bottom right of the window.
- Select Outgoing Server tab at the top.
- Select the box labelled My outgoing server (SMTP) requires authentication.
These steps are the same for Outlook 2003, 2007 and 2010.