Email List Hygiene: What It Is and Why It Matters
Key Points
Your contact database is one of your most valuable business assets, and it degrades on its own, losing 2-3% of its validity every month. (People change jobs/names, close accounts, abandon email addresses, etc., all the time.)
Left unchecked, list decay leads to bounces, spam complaints, and blocklisting, all of which hurt your ability to reach the people who matter most.
Validate your list before launching a new database or CRM, and again every 6-12 months, to keep it clean.
Getting off a blocklist is possible but slow and effortful. Prevention is far cheaper than recovery.
Good list hygiene is a small, regular habit that protects your sender reputation and keeps your outreach effective.
We’re not talking about any old list. This is your contact database, full of current and former clients, referral sources, and thought partners. It represents the richness of your network in a very real way.
We’re also talking about a horrifying, thankless task called list hygiene. Luckily, there are shortcuts to keeping your list up to date and relevant so you can stay top of mind with the people most important to you and your business.
Lists Decay Organically Over Time
Gone are the days when people had one personal or work address and stuck with it forever.
On average, contact databases (even your email address book) lose 2-3% of their validity each month as people change jobs, switch providers, pass away, close accounts, change their names, or abandon old addresses. An address that was perfectly good a year ago may now be dead, disabled, or turned into a spam trap. (We’ll talk about spam traps later.)
Left unmonitored, a once-valuable list simply degrades over time, and the damage shows up in ways that are expensive to reverse.
A warning: we’re about to get a little technical here. This next section takes you into the sausage-making of email marketing and how databases work. For the purposes of this discussion, we will put aside two things so we can focus solely on list health. Those things we’ll intentionally ignore are: 1) technical setup issues, such as sender authentication, IP warming, etc., and 2) open rates, click-through rates, and conversion rates.
It’s about Something Called “Sender Reputation”
Every sender of emails has a kind of invisible reputation or digital report card that exists in the invisible ether of email-land. The robots have come a long way when it comes to identifying and shutting down bad actors before they can do damage to everyday people. Gone are the email chain letters and more obvious spam attacks of old. A sender reputation is kind of like a credit score, if you will. It’s based on monitoring key technical metrics. These metrics are often collectively called “email deliverability.” Email validation, making sure your individual email addresses are good (valid), affects deliverability.
How’s Your Email Deliverability?
This is a measurement of whether your emails actually reach the intended inbox. It’s affected by such things as:
Bounce Rate (%): The percentage of emails that didn't make it to the intended inbox. There are also different kinds of bounces, such as a hard bounce that occurs when an address doesn’t exist.
Spam Complaint Rate (%): The percentage of recipients who marked your email as spam. Even a few complaints can significantly hurt deliverability, because this metric is heavily weighted.
Unsubscribe Rate (%): The percentage of recipients who opted out of your list.
Email Validation
This is the heart and soul of good email hygiene. There are highly reputable, affordable third-party email validation services that check for invalid emails in your list, which come in multiple flavors, such as:
Syntax Error: a simple typo, missing period, or other obvious spelling error
Dead Domain or Non-Existent Address: maybe the company no longer exists, or the person no longer works there.
Spam trap: An email address created specifically to catch senders with bad list habits. (It sounds sneaky and maybe rude, but this type of mechanism is there for our collective protection.)
An email validation tool will also check for and flag such emails as:
Role-based address: An email tied to a function rather than a person, like info@ or support@. These often go unread and can hurt engagement metrics.
Disposable email: A temporary, throwaway address used to sign up for something without revealing a real inbox.
Bad Things Happen if You Skip Regular Hygiene
If left untreated, a degraded list can rack up many bad reputation points and land you on the blocklist. Formerly known as the blacklist, the blocklist is a common registry maintained by email providers or security services that identifies senders (by domain or IP address) known for spammy behavior. Getting on one of these ruins your deliverability until you're removed. That means even a list of good, valid addresses looks suspect once you're on the blocklist.
It’s possible to get off a blocklist, like reclaiming your identity and credit score after identity theft. But it takes a lot of effort to do so. However, if you’ve been put on a blocklist and continue sending emails, it will make it much, much harder and slower to regain good standing.
Solution: Conduct List Hygiene Regularly
The email and security gods reward good behavior and punish suspicious and bad behavior. To steer clear of their bad opinion, simply do a bit of list hygiene regularly. Email list validation is inexpensive insurance against deliverability problems that are far more costly to fix after the fact. Building the habit into your operational calendar, once before any new database launch and then on a 6-to-12-month cycle, keeps your sending reputation healthy and your metrics trustworthy. The two most important times to do this are:
When you’re starting a new database or migrating to a new email platform/CRM. Validate first, then upload. Start clean, so you don’t have any risk.
Schedule regular maintenance every 6 to 12 months. If you have high email volume and high online form signups, more frequent is better. For most SMBs, once a year is recommended.
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