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Microsoft Windows Tips And Tricks!



Welcome!

Verify A email address without sending an email



Quick Check to verify a email address without sending an email!:

First - Find mail exchanger of whatever@example.com <--sample mail address
COMMAND:
Open Command prompt, then do the following commands:
nslookup -q=mx example.com
RESPONSE:
example.com MX preference = 10, mail exchanger = mail.example.com
mail.example.com internet address = 208.96.53.70

Second - Connect to mail server mail.example.com that you just found.

COMMAND:
telnet mail.example.com 25
RESPONSE:
220 mail.example.com ESMTP using Postfix.
COMMAND:
helo someaddress.com <- can be your real or a fake host address depending on mail server.
RESPONSE:
250 mail.example.com
COMMAND:
mail from: youremail@gmail.com
RESPONSE:
250 2.1.0 Ok
COMMAND:
rcpt to: user-you-want-to-check@example.com
RESPONSE:
550 5.1.1 <whatever@example.com>: Recipient address rejected: User unknown in local recipient table.
(Or a simalar response tells you that the user's email address is not valid.)
Or
RESPONSE:
250 2.11.0 ok: Enter "Data" and begin your message.
(Or a simalar response tells you that the user's email address is valid!)
COMMAND:
quit
RESPONSE:
221 2.0.0 Bye

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