Recently, we noticed an increase of in the number of ASNs (full blocks of IP addresses owned by individual Internet Providers) listed by UCEPROTECT on their Level 3, aka Draconic, blacklist. The purpose of this particular UCEPROTECT blacklist is to block ASNs that allow spam to be sent from a large number of IP addresses in the network, often these are ASNs setup for spam or providers that do not adequately police their customers. However, this includes many popular services so many legitimate businesses have also been affected.
- We provide Blacklist lookups for information purposes only. DO NOT make decisions exclusively based upon a listing on the Blacklists we check. MxToolbox is not blocking you, the Inbox Provider is blocking your email because your IP address or domain is listed on a blacklist that they are using to make email delivery decisions. We give you the opportunity to see who is listing your IP address and do not endorse any blacklist. Feel free to ignore a blacklist if you think it is not relevant.
- NEVER PAY to be delisted. Legitimate blacklists, including UCEPROTECT, have free ways to be delisted. In this case, the entire ASN should be automatically delisted when the UCEPROTECT SPAMSCORE for that ASN drops below a certain level in a 7 day moving average. You can learn more about how UCEPROTECT lists ASNs here.
- MxToolbox regularly reevaluates the list of blacklists we check. Our criteria requires the blacklist to be used to make email delivery decisions. We have noted that some companies are dropping UCEPROTECT from their decision criteria due to the recent activity. We will watch this issue but will also continue to show UCEPROTECT listings as long as they are being used for email delivery decisions.
What you can do if you are blacklisted
We know that being on a blacklist is affecting your business. Be patient! Blacklists are not out there to attack your legitimate email, they are there to protect everyone from spam and phishing attempts. They make money by being relevant to email delivery decisions and sometimes they get over zealous.
Take the opportunity to evaluate your email sending configuration, blacklists are not the only reason your email is failing to make the inbox.
- Are you still hosting your own email? This could be an opportunity to investigate Inbox Providers that have improved spam filtering and email sending capabilities. It is easier to have all of your email blocked by a blacklisting event if you are sending from a single IP address or small block.
- Are you using multiple 3rd party email providers? You should evaluate their performance and make sure each of them is in your SPF record and no one else.
- Adopt DMARC. DMARC compliant email is now a requirement to get into the inbox at Google, Yahoo! and Outlook.com/Office365. If much of your email is non-compliant, you may be blocked entirely. Adopt DMARC to get information on your outbound email to become DMARC compliant or be left behind by your competitors who are.
- Use a DMARC delivery tool. Inbox Providers give you information on your email senders, including spammers pretending to be you. You need a tool that can aggregate and analyze your email delivery posture using DMARC to improve your email configuration and block the spammers. MxToolbox Delivery Center was designed to make email delivery simpler by highlighting improvements to your email deliverability.