Filter out Microsoft and other problematic email providers from your cold email campaigns to improve deliverability and protect your sender reputation.
Your data never leaves your browser. All processing happens locally on your device for maximum privacy.
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Microsoft's email systems (Outlook, Office 365) have extremely strict spam filters that often place cold emails in spam folders, hurting your domain reputation. Filtering these providers can significantly improve your deliverability rates.
This tool identifies Microsoft, Outlook, Office 365, Zoho, Barracuda, and many other email security providers known to be challenging for cold email campaigns. It checks MX records to determine the actual email provider being used.
Yes! All processing happens in your browser. Your CSV data never leaves your computer or gets uploaded to any server. We use a CORS proxy only for the DNS lookups, but your actual email data remains local to your device.
The tool uses DNS MX record lookups which are very accurate for determining the actual email provider. However, some companies may use custom configurations that don't clearly identify their provider in the MX records.