It may happen that you have received an error message from us when you tried to send emails through our relay. A common cause for this is that emails from certain senders were blocked due to security measures. The typical error message that occurs in this context is:
554 5.7.2 Message rejected due to spam content from an unrecognized domain <envelope_from_domain>, please see https://support.hornetsecurity.com/hc/en-us/articles/26244162304273-Why-do-I-receive-an-error-message-when-sending-emails-with-certain-senders
Background
To better protect our customers, we have tightened our security measures. We want to ensure that our system is not misused for sending spam or unwanted emails. These measures include, among other things, that only emails from registered and recognized domains are allowed to be sent through our relay system.
Solution
To ensure that email sending through our systems works smoothly, it is necessary for the respective domain to be registered in our system. You can conveniently do this through our Control Panel.
Steps to Register the Domain:
- Log in to the Control Panel with your credentials.
- Navigate to "Customer Settings."
- Click on the "Domains" menu item.
- Add the domain you want to use for email sending.
- Important! Verify your domain according to this manual article: Domain Verification
If you encounter any problems during this process, please feel free to contact our support.