SMTP Checker

Verify if an email address exists by connecting directly to the mail server via SMTP.

Enter Email Address

Check if an email mailbox exists by connecting to its SMTP server

How SMTP Verification Works

SMTP verification connects directly to the mail server and simulates sending an email to check if the mailbox exists. This is the most accurate way to verify email addresses.

1. DNS Lookup

Find MX records via DNS

2. TCP Connect

Connect on port 25

3. EHLO/HELO

Greet the server

4. MAIL FROM

Set sender address

5. RCPT TO

Check if recipient exists