Email Hippo (free check)
WorkingPaid
Free email address validation (syntax, domain, mailbox).
Email Addresses
8 OSINT tools and guides. Use them lawfully and ethically.
Email verification (2)
Hunter Email Verifier
WorkingPaidLogin required
Checks whether an email address is deliverable and shows public sources for it.
Account lookup (1)
Epieos
May be blockedPaid
Shows which public accounts (e.g. Google) are tied to an email address or phone number.
Header & reputation (3)
EmailRep
WorkingPaid
Reputation score for an email address (age, breaches, social presence).
Google Admin Toolbox Messageheader
WorkingFree
Parses raw email headers to show the delivery path, delays and SPF/DKIM results.
MXToolbox
WorkingPaid
MX, SPF, DMARC and blacklist lookups for an email domain.
Breach exposure (1)
Have I Been Pwned (email)
WorkingFree
Shows which known breaches an email address appeared in, without exposing the leaked data.
Launch pages & guides (1)
IntelTechniques Email tools
WorkingFree
Email search launch page linking common lookups.