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Impressionwise

Know What Is Safe to Send·impressionwise.com

Impressionwise is a deliverability intelligence platform that verifies email addresses and detects hidden threats such as spam traps, honeypots, disposable addresses, and malicious domains. It analyzes over 240 independent signals to help senders know what is safe to send, protect sender reputation, and reduce blacklist exposure. The platform includes blacklist monitoring, domain validation, and API/bulk-processing tools for integrating verification into existing email workflows.

What it's for

Validating email addresses before sending campaignsDetecting spam traps, honeypots, and contributing molesRemoving disposable, role-based, and dormant addresses from listsMonitoring domains and IPs against email blacklistsIdentifying catch-all and blackhole domainsAssessing accept-all (catch-all) address deliverabilityBulk list cleansing via file upload or API

Features 18

Accept-all (catch-all) verification service
Automated event notifications
Blackhole and catch-all address detection
Blacklist monitoring across 230+ RBL and URIBL sources
Bulk API list submission
Bulk FTP file transfer
Client portal for account and credit management
Credits Balance API
Detection of pristine and recycled spam traps
Domain Health Check / domain validation
Honeypot and contributing mole detection
List Profile Reports
Real-time email verification
Third-party oversight seed detection
Threat Intelligence Center
Threats API
Typo and fake email domain detection
Verification/Threats API

At a glance

free trialAPI

TypeWeb app

DeploymentCloud

PlatformsWeb

Foremail marketers, lead generation companies, e-commerce businesses, SaaS companies, nonprofits, political organizations

Complianceself-reported

GDPRCCPACAN-SPAMISO 27001

Resources

Docs

Pricing

Pricing is credit-based rather than a recurring subscription; minimum purchase is 15,000 credits for $87.00. Enterprise accounts over 1,000,000 (and over 50,000,000) credits use custom negotiated pricing available by contacting the company.

Pay as you go (Service Credits)Quote

Covers Verification with Threat Removal, Threat Removal Only, and Accept-All Verification service options; payable by credit card, ACH, or PayPal.

Minimum purchase size is 15,000 credits.

EnterpriseQuote

Specially negotiated pricing and terms; contact an account representative for a quote.

For accounts over 1,000,000 credits, with a further tier over 50,000,000 credits.

Larger credit purchases unlock lower per-credit rates, e.g. upgrading to 1,000,000 credits for $30.00 versus smaller tiered purchases.