01
Submit an email
Enter the email address that you want the verification workflow to evaluate.
LastDatabase JIT Engine
JIT Email Verifier
Evaluate an email address using current syntax, domain, DNS, MX, SMTP and catch-all signals. LastDatabase runs verification when it is requested instead of relying only on an older result.
Email Verification
JIT Check
name@company.com
Syntax
Checked
Domain & MX
Checked
SMTP signal
Evaluated
Catch-all
Classified
JIT
Verification on request
DNS + MX
Mail infrastructure signals
SMTP
Available server signals
50 Free
Free verification plan
How JIT email verification works
The verification workflow evaluates multiple technical signals when a verification request is made.
02
Inspect the domain
The workflow checks address syntax and relevant domain, DNS and mail exchange signals.
03
Evaluate SMTP signals
Where available, current mail server responses contribute to the verification result.
04
Review the result
Use the returned status and supporting signals when deciding how to handle the email address.
Signals evaluated by the engine
Verification is more useful when the result is supported by several independent technical signals.
Syntax
Checks whether the address follows expected email address formatting rules.
Domain
Evaluates domain and DNS information relevant to email infrastructure.
MX Records
Checks available mail exchange configuration for the domain.
SMTP
Uses available mail server interaction signals when the receiving infrastructure permits them.
Catch-All
Identifies signals associated with domains that may accept mail for many mailbox names.
Current Evaluation
Runs the verification workflow when verification is requested, reducing reliance on stale historical status alone.
Email verification pricing
Verification credits are separate from LastDatabase lead credits. Choose a plan based on your email verification volume.
Free
$0
50 email verifications
- JIT verification workflow
- Verification signals
- No paid plan required
Starter
$80
/ month
10,000 email verifications
- JIT verification workflow
- Syntax, DNS & MX signals
- SMTP & catch-all signals
Growth
$160
/ month
25,000 email verifications
- JIT verification workflow
- Higher monthly volume
- Verification signals
Business
$300
/ month
50,000 email verifications
- JIT verification workflow
- Business-scale volume
- Verification signals
Email Verifier FAQ
Common questions about email verification and the LastDatabase JIT verification workflow.
What is an email verifier?
An email verifier evaluates technical signals associated with an email address. These can include syntax, domain configuration, MX records and available server signals.
What does JIT verification mean?
JIT means the verification workflow runs when the verification is requested, rather than depending only on an older stored verification result.
Does verification guarantee delivery?
No. Verification can reduce uncertainty, but delivery also depends on receiving servers, sender reputation, filtering, policy changes and other factors outside the verifier.
What is a catch-all domain?
A catch-all domain may accept messages for multiple or potentially arbitrary mailbox names. This can reduce the certainty available from a mailbox-level check.
Are verification credits separate from lead credits?
Yes. Email verification plans and their usage are separate from LastDatabase lead record credits.
How many free verifications are included?
The free email verification plan includes 50 email verifications.
Verify your first 50 emails free
Open the LastDatabase email verification workspace and use your verification credits with the JIT verification workflow.
Start Email VerificationEmail verification evaluates technical signals available at the time of the check. It does not guarantee message delivery. Delivery can also depend on receiving systems, filtering, sender reputation and subsequent infrastructure changes.