Identify the ESPs of your email list.

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Improve email deliverability

What is ESP Matching?

ESP Matching is a strategy that improves email deliverability by identifying the email service provider (ESP) of your recipients—such as Gmail, Outlook, or Yahoo—and sending emails from the same ESP. This approach helps ensure emails land in the inbox rather than the spam folder.

• Higher inbox placement. Gmail and Outlook prefer emails from their own servers and often filter out messages from low-quality providers.
• Improved email authentication. Minimizes issues with SPF, DKIM, and DMARC authentication, which can cause emails from different ESPs to be rejected or marked as suspicious.
• Faster email delivery. Emails sent within the same ESP have lower latency and faster processing, ensuring they reach recipients without unnecessary delays.

How it works?

Follow these three simple steps to identify ESPs and improve your email strategy. And send emails from the matching ESP for better inbox placement and deliverability.

1. Upload & Analyze
   Upload your email list, and our tool will detect the ESP for each email and identify any spam protection tools in use.

2. Segment by ESP
   Get a report showing the ESP of each email. You can then manually separate your list into groups like Gmail, Outlook, and Others based on your needs.

3. Send with Matching ESP
   Use the segmented list to send emails from the same ESP as your recipients. Sending Gmail to Gmail and Outlook to Outlook improves trust and inbox placement.

Supported ESPs & Spam Protection Tools

We continuously update our list of ESPs and Spam Protection Tools for accurate analysis.

Frequently asked questions

1. What is ESP Matching, and why does it matter?
   ESP Matching helps you identify the Email Service Provider (ESP) of an email address (Gmail, Outlook, Yahoo, etc.) so you can send emails from the same provider for better inbox placement and deliverability.

2. How does GetESP.io work?
   Simply upload a CSV with email addresses and domains, and our tool will analyze each one, detecting its ESP and any spam protection tools in place. You can then download segmented lists to optimize your email campaigns.

3. Why should I segment my email campaigns by ESP?
   Emails sent from the same ESP (Gmail → Gmail, Outlook → Outlook) have a higher chance of landing in the inbox. Segmenting also helps you avoid wasting emails on spam-protected contacts that may block your messages.

4. What are spam protection tools, and how do they affect email deliverability?
   Spam protection tools like Proofpoint, Mimecast, and Barracuda act as security filters for business domains. They can block emails entirely before they even reach Gmail or Outlook, leading to misleading deliverability stats.

5. How can GetESP.io help improve my email deliverability?
   By identifying ESPs and spam protection tools, you can: ✅ Send emails from the right provider for better inbox placement ✅ Prioritize ESP contacts first before sending to spam-protected domains ✅ Avoid wasted sending limits on blocked emails

6. Is GetESP.io free to use?
   Yes! GetESP.io is currently free to use. As we continue to improve the tool, we may introduce premium features, but the core ESP analysis will always remain accessible.