
Do your promotional emails end up in your target customers’ spam folders, or do they not open them, fearing financial or other types of fraud? Then, what you need is a spam checker to save your marketing campaigns from failing.
Email spam checkers ensure your marketing emails, newsletters, and other important communications reach your target’s inbox, improving your reputation and boosting engagement by detecting issues like spam trigger words, poor formatting, DNS records, or blacklisting before sending the mail.
All in all, an online spam email checker helps you avoid being seen as a spammer, preventing revenue loss and missed opportunities.
Hence, this article walks you through the best email spam checkers, such as Lemlist, GlockApps, Forderly, MXToolbox, and Experte Email Finder. These are not randomly picked spam testers; we selected them after thoughtfully evaluating their spam detection accuracy, user-friendliness, integration opportunities, reporting and analytics features, cost and scalability, reputation and reviews, available customer support, and availability of a trial period or demo.
Let’s get right into them to save precious time.
What Is the Best Spam Checker for Windows
The best online spam checkers include names like Lemlist, GlockApps, Forderly, MXToolbox, and Experte Email Finder. Below is our review of all these mail testers.
1. Lemlist
Meet Lemlist. It is among the best email spam checkers for Windows that checks your email for spam-triggering words and boosts your odds of landing in the inbox of your desired audience. Moreover, it is well-known for its user-friendly interface and the following notable features.
Key features
- A warm-up feature that gradually increases your email volume, building trust with email service providers and reducing the chances of being flagged as spam.
- It integrates with email verification tools, helping you verify email addresses, reduce bounces, and improve your reputation.
- Lemlist allows you to monitor deliverability scores and perform email block tracking to stay informed about potential spam problems.
Pros
- Cold outreach personalization at scale with AI and multichannel automation
- A comprehensive suite for sales outreach, including email enrichment, a B2B lead database, and integrations
- Excellent growth hacking community and a network of lead generation experts
Cons
- Some features, such as warm-up and email enrichment, come at an extra cost
- A few users reported issues with deliverability and email tracking

Click here to learn more about Lemlist
Also know: Privacy Issues with Social Media: How to Stay Protected on Social Media
2. GlockApps
Next, we have GlockApps on our list of the best spam checkers for Windows. With this detailed email deliverability and spam checking tool, you can effortlessly identify and solve problems preventing your emails from reaching inboxes. Moreover, comprehensive reporting on email reputation and deliverability across different mailboxes, and the following features are what we like most about this platform.
Key features
- It lets you instantly check the exact placement of your email, i.e., whether it lands in the inbox, tabs, spam, or goes missing.
- GlockApps shows an overall spam score and flags specific issues that hurt your deliverability.
- You can run a free check to know if your sender IP address forms a part of major blocklists.
- It performs a complete content analysis (checking everything ranging from images to HTML code) to identify potential spam triggers.
- With GlockApps, you can check if your domain has a valid SPF (Sender Policy Framework) record, an essential factor in proving an email is authorized.
Pros
- DKIM (DomainKeys Identified Mail) verification, ensuring an email is digitally signed and trusted by servers
- DMARC (Domain-based Message Authentication, Reporting, and Conformance) policy to prevent email security and deliverability
- A straightforward and easy-to-operate email spam checker online
Cons
- Not-so-good customer support

Click here to learn more about GlockApps
3. Folderly
The next position in our list of the best email spam testers is Folderly, a cloud-based service to test emails to optimize your email campaigns and reduce the chances of your emails getting marked as spam. Additionally, Folderly delights users with a sender score (a reliability metric for your emails), mailbox warming (gradually increasing emails to build a positive reputation), and the following remarkable features.
Key features
- It tracks where your email ends up, in the inbox, promotions, or spam
- Forderly verifies your DMARC, DKIM, and SPF records.
- It detects what makes your email a spam and helps fix it.
Pros
- Improves email deliverability
- Follows a proactive approach, detecting problems before they arise
Cons
- More expensive than other similar mail checkers
- Users have little to no control over the automated warm-up process and its algorithms

Click here to learn more about Folderly
4. MXToolbox
We would now like to introduce you to MXToolbox. One of the most likable things about MXToolbox is that it scans your email infrastructure and not only words that are spammy to check spam. Moreover, this tool offers the following features that make it one of the best online spam checkers.
Key features
- It gives you detailed and actionable information about spam complaints received by email service providers regarding your emails.
- MXToolbox boasts inbox placement analysis to ensure your emails go to the inbox, not the spam folder.
- You can check your DNS, MX records, and overall domain health.
- It checks your domain and IP against over 100 real-time DNS-based blacklists to help identify and solve sender problems.
Pros
- Real-time server performance and mail flow analysis
- Complete domain health monitoring
- Header analysis by pasting email headers from test emails to get a detailed report on factors impacting deliverability
Cons
- No email content analysis
- Beginners may find it complex and overwhelming

Click here to learn more about MXToolbox
5. Experte Email Finder
The list of the best email spam testers is never complete without mentioning Experte Email Finder. This easy-to-use and free email spam checker is an expert at testing your emails for spam triggers and deliverability via a unique test email address.
Moreover, it analyzes your email’s content using SpamAssassin to identify whether it will go to the inbox or be flagged as spam by filters like Gmail’s. Furthermore, the following are some other noteworthy features of this Google spam checker.
Key features
- It provides a deliverability score, indicating how likely your email is to land in the recipient’s inbox and not their spam folder.
- With Experte, you can check the authentication records of your email account.
- This tool also allows you to test newsletters for spam triggers.
Pros
- No limit on the number of emails you can check
- Straightforward and easy to use
Cons
- Does not provide much information about how to reduce the spam score in email content

Click here to learn more about Experte Email Finder
Also know: How to Activate Windows Security on Your Device: Windows 11 and 10
Best Spam Checkers for Windows: The Conclusion
So, that’s how to make sure your emails go to the inbox of your targets and not disappear somewhere in their spam box, making your campaigns successful. You can choose any spam checker from the list above, depending on your requirements, to do the needful.
However, if you need more help with the email spam test or have any questions/suggestions about this article, do not hesitate to let us know via the comments section below.