Email List Health Checker
Paste your list to instantly identify syntax errors, duplicate records, and risky role-based addresses before you hit send.
Paste a list and click Analyze to see your health score.
Frequently Asked Questions
Learn why email list hygiene is the foundation of successful B2B outbound marketing and how to protect your domain reputation.
Sending emails to unverified, poorly formatted, or duplicate addresses directly harms your domain’s sender reputation. When email service providers (ESPs) like Google and Microsoft see high bounce rates from your domain, they start routing your emails directly to the spam folder. Maintaining a clean list ensures higher deliverability, better open rates, and protects your primary business domain from being blacklisted.
Role-based emails are addresses assigned to a position or department rather than a specific person (e.g., info@, sales@, support@, admin@). These are highly risky for outbound campaigns because they are often managed by multiple people or act as catch-all inboxes. Sending cold outreach to these addresses frequently results in high spam complaints and very low engagement rates.
No, this tool performs instant, browser-based “surface hygiene.” It analyzes your list for critical syntax errors, eliminates duplicates, and flags risky role-based prefixes without pinging the recipient’s server. If you need deep, server-level SMTP validation to guarantee a contact is currently active, we recommend sourcing your data directly through a premium platform like Accurate List.
Duplicate records in your CRM or sending software cause you to email the exact same prospect multiple times within the same sequence. Not only does this look unprofessional and annoy the recipient (leading to immediate unsubscribes or spam reports), but it also wastes your daily sending limits and skews your campaign analytics.