The main cause for a 550 Relaying Denied error message is due to incorrect settings in your email software, or your email software is not authenticating correctly with our email servers.
In our experience the three most common causes are that you haven't authenticated, your domain is not configured or your email client is not configured correctly.
Please note that in each of these cases you will receive the same error, so we recommend that you check your email client configuration first (please read "not authenticated" for more information) and then check your domain configuration with Gradwell (please read "domain not configured" for more information).
If you are a Gradwell customer and wish to use our mail cluster for sending your outgoing mail, you must either use SMTP AUTH or the SMTP after POP3 relaying technique, where we allow an IP address to relay through our mail cluster for up to three hours after a successful login.
Please note that SMTP AUTH is much more reliable since occasionally the SMTP after POP3 relaying list can get out of date, usually during periods of very high load.
Domain not configured
If you are Gradwell customer and you (or one of your correspondents) see this error when sending mail to one of your Gradwell hosted domains, then it means that you have not correctly set up the domain in the control panel.
You must set up the domain in one of the following areas of your control panel before we will accept mail for the domain:
- Mail Forwarding
- Secondary MX
- Secondary DNS
If you are not a Gradwell customer and you receive this error, then either you are incorrectly using our cluster as your smart host, or you are sending to a Gradwell hosted domain.
In the first case, you should correct the settings in your email program.
In the second case, if possible, you may want to contact your correspondent by other means and inform them of their configuration problem.