Email marketing stands as a powerhouse digital marketing tactic, with the best campaigns often yielding an astonishing 4200% ROI. Your email subscriber list is undoubtedly one of your most valuable assets. However, not every subscriber on that list remains active or engaged. This is precisely where email scrubbing becomes essential.
**Email scrubbing is the crucial process of removing bad, inactive, or duplicate email addresses from your subscriber list.** By doing so, you significantly improve email deliverability and can focus your efforts on subscribers who are genuinely interested in your content and offerings. Keeping bad emails on your list costs money; with regular email list scrubbing, your ROI increases as you make room for high-quality, engaged subscribers.
This comprehensive guide will cover everything you need to know about email scrubbing, including its definition, benefits, how to perform it effectively, and the top services that can assist you.
Email Scrubbing: 3 Warning Signs Your List Needs Attention
You invest time and money into building your email list, so it only makes sense to maintain its health. But how do you identify if your email list requires a refresh? Here are three classic signs that indicate it’s time to scrub your email list:
1. Low Open Rate
Your email marketing metrics are the first place to look for clues about list health. If your open rates and click rates have steadily declined, it’s a strong indicator that a significant portion of your list is unengaged. A consistently low open rate suggests you’re sending emails to many who aren’t interested, wasting resources. Cleaning your list of these inactive subscribers ensures your messages reach those more likely to open and click, preventing missed revenue opportunities.
2. Spam Complaints
Are your spam complaints unusually high? Being flagged as spam is a serious email marketing issue and a definitive sign that certain subscribers should be removed. Mailbox providers like Yahoo and Gmail log these complaints. If too many are detected, they may begin sending your emails directly to the spam folder for *all* recipients, not just those who reported you. Subscribers might also mark your emails as spam simply because they don’t remember opting in, highlighting the need for a clean, engaged list.
3. High Number of Unsubscribes
A rising number of people opting out of your emails is another significant red flag. Investigate the signup source for these unsubscribes and check for any invalid email addresses. Scrubbing your list to remove these contacts is crucial. You might also need to refine your targeting to ensure you’re reaching audiences genuinely interested in your services.
Here are four typical scenarios that warrant extra vigilance regarding your email list’s health and the potential need for cleaning services:
- If you **import a new list**, make sure to validate and clean it before sending any emails.
- When you’re moving from one **Email Service Provider (ESP)** to another, it’s a perfect time to scrub your list to ensure a clean start.
- When you’re trying to scale a business with email marketing, good email hygiene is an absolute must.
- Keep an extra eye out for emails going through **third-party integrations**, especially those connected to platforms like WordPress.
Unlocking Success: The Benefits of Email Scrubbing
Email scrubbing offers numerous advantages, particularly because disengaged subscribers provide no value and can even harm your efforts. Let’s explore how a sparkling clean email subscription list strengthens your overall marketing strategy:
1. Reduce Costs
Every email you send incurs a cost, however small per subscriber. These amounts can quickly accumulate. If your list is populated with invalid, duplicate addresses, or inactive subscribers, you’re essentially throwing money away on emails that will never be read. Removing these unengaged contacts immediately improves the ROI of your email marketing campaigns. This also means your marketing budget is concentrated on individuals more likely to become customers or leads, allowing you more room to optimize your strategy and guide engaged subscribers down the conversion funnel.
2. Reduces Bounces and Spam Complaints
After meticulously crafting a smart email marketing campaign, it’s incredibly frustrating when messages bounce back. Campaigns with high bounce rates simply won’t be successful. Furthermore, bounced emails negatively impact your sender reputation, just like spam complaints. Email scrubbing services help you remove addresses that frequently bounce, whether due to a misspelling or a full inbox. This dramatically boosts email deliverability for every campaign you send.
3. Remove Spam Traps
Spam traps are email addresses strategically deployed by ISPs (Internet Service Providers), anti-spam organizations, and companies to identify and monitor spam senders. Even if you’re not a spammer, these traps can inadvertently end up on your contact list. Having a spam trap in your list can lead to your IP or domain being blacklisted, severely damaging your sending reputation and email deliverability. The most effective way to prevent falling into spam traps is to regularly clean your email list. Most reputable email list cleaning services specialize in identifying and removing these from your list.
4. Increases Open and Click Rates
A direct and natural consequence of email scrubbing is a significant increase in your open rates and click rates. This occurs because you’re now sending emails exclusively to people who genuinely want to receive them, and these metrics are calculated as a percentage of total emails sent. Email scrubbing also ensures fewer people mark your messages as spam, which improves your standing with email service providers and boosts your overall deliverability. Naturally, better open and click rates directly translate to more conversions and sales.
Prepare for Email Scrubbing: Essential Steps
Before diving into the actual email scrubbing process, there are a couple of crucial preparatory steps you need to take.
1. Decide Which Lists to Scrub
While it might seem logical to start with your most active email lists, as they drive leads and conversions, the greatest potential for improvement often lies within older, less engaged lists. Unengaged subscribers here may still be counted in your total, artificially inflating your list size and costs. The best practice is to scrub *all* your lists on a regular basis to maintain optimal health across the board.
2. Figure Out Why Your Emails Bounce
Understanding the reasons behind bounced emails is critical. Is it a simple misspelling, or something more serious? Bounced emails are categorized as either “hard” or “soft.” Platforms like Mailchimp often provide detailed reports in their “View Reports” section, allowing you to differentiate. A hard bounce indicates a permanent error (e.g., the domain name doesn’t exist), meaning emails will never reach that recipient. A soft bounce signifies a temporary problem (e.g., full inbox), but multiple soft bounces to the same address also suggest undeliverability. Identifying these helps you pinpoint the source of problems and take appropriate action, though many list scrubbing services already handle this analysis.
A Step-by-Step Guide to Email List Scrubbing
We’ve explored *when* to scrub your email list and *why* it’s so beneficial. Now, let’s delve into the precise steps involved in the email scrubbing process to achieve the best results:
1. Segment Inactive Subscribers
The first step is to identify and separate recipients you suspect of being inactive from your engaged subscribers’ list. Your email marketing platform or scrubbing service should be able to assist you with this segmentation. For instance, the MailChimp dashboard allows you to segment users based on their activity.
But what criteria define an inactive subscriber? A general guideline suggests considering anyone who hasn’t opened your emails in 90 days as inactive. These are individuals who haven’t bothered to unsubscribe but aren’t engaging with your messages either. This timeframe may vary depending on your email sending frequency.
2. Identify Invalid Email Addresses
Your email subscription list likely contains various invalid addresses, including duplicates, spam traps, or simple misspellings. We all know how easy it is to make a typo, and even one incorrect character can prevent delivery. Additionally, you must be vigilant against spam email addresses, which may be collecting information for malicious purposes.
It’s also common in workplace communications for individuals to subscribe multiple times. If your list is unexpectedly large, it might contain numerous duplicate entries. Removing these is crucial for gaining an accurate understanding of your email marketing performance. Manually identifying all these issues is incredibly difficult, which is where specialized email scrubbing services prove invaluable. Services like NeverBounce, for example, are designed to identify invalid email addresses, ensuring your list is filtered and impeccably clean.
3. Re-engage for a Win-back
Once you’ve segmented your inactive subscribers, they deserve a final attempt at re-engagement before permanent removal. This is your last opportunity to win them back. Consider sending a personalized email with a compelling incentive, such as a discount, a special offer, or exclusive content, to entice them back into the fold. Directly ask if they wish to remain subscribed, and it’s highly beneficial to inquire about their reasons for disengagement if they choose to leave. This feedback can provide valuable insights for improving your messaging or services in the future, as exemplified by a simple win-back email from Asana.
4. Remove Email Addresses
At this stage, you’ve identified the email subscribers who clearly don’t want to hear from you, and your re-engagement efforts were unsuccessful. It’s time to bid them farewell from your active mailing list. By doing so, you can focus your energy on the engaged, active subscribers who are truly helping your business grow.
If you’re using an email cleaning service or a platform like MailChimp, simply navigate to the segment you created for inactive users and select the “unsubscribe” option. This action will automatically remove all inactive users from your primary mailing list. Most SaaS marketing automation platforms have a similar unsubscribe or removal option.
However, it’s important not to permanently delete these contacts from your overall database. You might find a different use for them later. Consider maintaining them in a separate database for alternative marketing strategies, such as social media outreach or even cold calling through your contact centers.
5. Determine Reasons for Low Engagement
You’ve successfully removed disengaged subscribers, but have you identified *how* they reached that point? If your initial targeting was accurate, it’s highly beneficial to understand why and when recipients lost interest. This insight helps you refine your email marketing strategy, preventing other subscribers from following the same path.
Factors like the absence of a custom domain name, for example, can impact email deliverability. Service providers often favor emails originating from custom domain names over generic ones like gmail.com or hotmail.com. Exploring services that offer free email with custom domain names can help address this.
3 Best Email Scrubbing Services to Consider
Manually cleaning a large email list is a laborious task. Utilizing email scrubbing software is essential to save time and accurately identify which addresses to remove. We’ve compiled a short list of highly-rated services to assist you:
1. Bouncer email validation
Bouncer is a robust email verification service designed to help you find misspelled, duplicate, spam, and risky email addresses. It also checks for various types of bounces caused by expired or non-existent domain names.
**Pros:**
- It’s free to get started with 100 free credits.
- Offers highly accurate bulk email verification.
- Features excellent integrations with popular marketing tools.
- Their pricing is competitive, with a pay-as-you-go option.
**Cons:**
- Free email verification only shows basic information.
Bouncer offers 100 free credits with access to main features. Their pricing costs $0.008/email if you’re checking 4,000 emails, with prices per verified email decreasing as the volume increases.
2. ZeroBounce
ZeroBounce is another highly popular email verification service. It helps identify email typos, spam traps, and abusive email accounts that can lead to unwanted signups. This powerful email scrubbing tool provides a clean database through bulk email verification and a blacklist monitoring service.
**Pros:**
- Highly secured platform.
- Allows you to score subscribers based on their interactions.
**Cons:**
- May not be the best option if you’re looking for the absolute cheapest service.
- Some users report that the support provided is not as responsive as with other services.
3. KickBox
KickBox verifies every email address on your list to maximize inbox placement. This email verification service validates emails without sending any actual messages, offering real-time email verification, bulk email list cleaning, and real-time API support. It also connects seamlessly with most email marketing automation services and Zapier.
**Pros:**
- Quick and easy to set up and navigate.
- Provides email validation at the point of signup.
- GDPR compliant with both US and EU servers.
**Cons:**
- Generally more expensive than some other services.
You can compare the prices of Kickbox in their pricing guide.
Using an Email List Cleaning Service: When Less is More
Cleaning your email list to contain only high-quality, engaged subscribers will inevitably boost your engagement rates. Email list scrubbing effectively removes unengaged or even harmful subscribers that can sabotage your email marketing efforts. Aim to clean your email list a few times a year for optimal results and consistent performance.