When an email you’ve sent bounces with Error 550 Sender Email Address Rejected, Message Rejected (or blocked), a spam filter has blocked the message. That’s because your email domain appears in what’s called a Real-time Blackhole List (RBL). In such cases, you’ll have to take action to have your email whitelisted as non-spam.
Is my email domain blacklisted?
You can quickly check to see if your domain (or server) is blacklisted. Click on the following link to search your domain against real-time blacklists:
https://mxtoolbox.com/blacklists.aspx
How do I prevent my domain email from being blacklisted?
The easiest way to avoid landing on a blacklist is NOT to use your domain name to send out email campaigns! Another reason you can get blacklisted is due to malware or viruses on your computer. Run a malware check and removal app or contact https://fastsupport.ca to have someone help you do this quickly. Remember to keep your anti-virus software up to date, make sure your computer has the latest security updates, and change your email password just in case.
You can also get blacklisted when your company’s web applications like WordPress, Joomla or Magento, are exploited through malware or a virus and used to send spam email. When that happens, your web app sends out spam using your domain name and the domain name itself gets blacklisted.
Keeping hackers out of your web application
Here’s what you can do to prevent hackers from hijacking your web app:
- Upgrade to a Business Plan, and Malware Removal and Component Updates are Included With Your Plan
- If you manage your own site, please keep website software updated. Make checking website software a daily routine.
- Prevent SQL injection attacks by parameterizing SQL queries.
- Validate forms data on both the client and the server side.
- Use strong passwords of at least 10 characters and make sure your web application stores those passwords as encrypted values.
What do I do if I’m still blacklisted?
If the steps above fail to delist your email domain, contact FastSupport for immediate assistance - our hosting plans do not include this type of support. In your support ticket, please include your email address, the email address you were mailing, the subject line of the rejected email, and the date and time it bounced.
