If you run an online business, you know how important it is to have a good website, a reliable email setup, and a strong online reputation. Without these things, you lose your customers’ trust and therefore don’t get many sales or engagement.
Today, we are going to discuss the technical side of reputation. Two types matter most: domain reputation and IP reputation.
They are related, but they are fundamentally different. Understanding what affects them can help you identify problems in your online setup and fix them.
So, let’s learn about them in appropriate detail.
What Is IP Reputation?
IP reputation is the simpler of the two, so let’s discuss that first. Simply put, an IP reputation is the level of trust associated with a specific IP address.
IP addresses identify servers and devices on the internet. The actions those devices take can be traced back to them using the IP address. That activity is then used to calculate a trust level for that IP address, also known as its IP reputation.
IP reputation is mostly relevant to email. Email service providers (ESPs) evaluate the IP of origin of any email they receive before deciding whether to add it to the spam folder, main folder, or outright reject it.
If the IP of origin has been associated with spam or abusive behavior, messages sent from it may be filtered or rejected.
Here are some important factors that affect IP reputation.
- Spam originating from the address
- Malware or suspicious traffic from that address
- Sudden and large changes in sending volume of emails
- The behavior of the previous users of the IP address can affect new users
- The behavior of other users in a shared hosting or shared email infrastructure
- Reports from security and reputation databases
As you can see, using a shared IP pool can be problematic because of IP reputation. So using a dedicated IP is preferable, as you can control its reputation via your actions.
What Is Domain Reputation?
If IP reputation relates to one IP address, domain reputation relates to an entire domain. This includes all subdomains and any IP addresses associated with them. So, it is far more comprehensive than simple IP reputation.
For example, if you regularly send emails from example.com, email providers can build a reputation around that domain based on how recipients and other systems interact with your messages.
Here are some factors that affect domain reputation.
- Email engagement and complaint rates
- Spam reports
- Phishing or malicious activity associated with the domain
- Authentication records such as SPF, DKIM, and DMARC
- Sending patterns and volume
- Links and domains included in emails
From those factors, we can gather two things:
- A domain that sends consistent, legitimate emails that get opened builds a stronger reputation over time.
- A domain that sends spam, fluctuates in email volume, and is associated with suspicious activity tanks its reputation quickly.
Domain reputation is particularly important for businesses that rely heavily on email marketing, transactional emails, newsletters, or customer notifications.
Domain Reputation vs. IP Reputation
Now, let’s highlight their differences in a head-to-head.
The easiest way to understand the difference is to think about what is being judged. See the table below for a clearer picture.
As you can see, neither reputation is completely isolated from the other. Both are affected by similar things and can affect each other as well. For example, the domain reputation may be affected if only one of its associated IP addresses has a bad reputation.
Also, changing your mail server may give you a different IP address, but your domain reputation can remain associated with your domain. Likewise, moving to a new domain does not automatically make a problematic IP trustworthy. So, the bad rep can follow you around.
How to Check Your Domain Reputation
There isn't always a single universal score that tells you whether a domain is trustworthy. Different email providers and security services use their own signals and databases.
Here’s what you can do to check your domain reputation.
Start by using an online domain reputation checker. Many such tools are available, but the one by Spamhaus is pretty good. It provides an aggregate score that gives you a good idea of your domain's reputation.
But that’s just one way. You can also use a blacklist checker to determine if your domain and its associated IPs are on a blacklist or not. Blacklists are public lists maintained by various security firms and organizations. These catalog domains and IPs with bad reputations. ESPs use these to filter incoming email.
You should also review your email authentication setup. SPF, DKIM, and DMARC records are used to authenticate and verify your domain. They help receiving systems verify that your messages are authorized and have not been improperly modified. So always ensure those records are set up correctly.
You can also do some tests on your own to see if your domain reputation is bad or not. For example, check the following:
- Increasing bounce rates of your emails
- More spam complaints against your domain
- Falling email open or engagement rates
- Sudden changes in delivery (i.e., emails not landing in the inbox)
- Messages consistently reaching spam folders
If several of these problems appear at the same time, you may need to investigate your domain reputation.
How to Check Your IP Reputation
Checking IP reputation involves looking at the history and current status of a specific IP address.
You can use an IP reputation checker to test whether an address has been flagged by reputation or security databases. It works similarly to a blacklist checker: it queries various lists created by security organizations to see whether your IP address appears on them.
This can be useful when troubleshooting email delivery problems. For example, if your domain reputation seems fine, but your messages suddenly start bouncing or landing in spam, checking the sending server's IP can help determine whether the address itself is contributing to the problem.
If you're managing your own server, you should also monitor the traffic leaving the address. Unexpected outbound activity could indicate compromised accounts, malware, or another security problem.
If Your IP or Domain Reputation is Bad, What Should You Fix First?
The answer depends on what your tests reveal.
If the IP address has a poor reputation, investigate the activity originating from that address. This is particularly important with shared hosting or shared email infrastructure because another user can potentially affect the reputation of an address you also rely on.
If the domain has reputation problems, review your email practices, authentication records, recipient lists, and recent campaigns.
If both look problematic, address the underlying cause before simply changing infrastructure. Moving to a new IP or domain without fixing the behavior that caused the problem can eventually recreate the same issue.
Final Thoughts
Domain and IP reputation are two different pieces of the same trust puzzle.
Domain reputation tells you how your domain is perceived, while IP reputation focuses on the address from which your traffic originates. Both can influence email delivery, security decisions, and how other systems treat your online activity.
When troubleshooting reputation problems, don't rely on a single check. Examine the domain, test the associated IP address, verify authentication records, and review your recent traffic and sending behavior.
