Quick Check to verify a email address without sending an email!:
First - Find mail exchanger of firstname.lastname@example.org <--sample mail address
Open Command prompt, then do the following commands:
nslookup -q=mx example.com
example.com MX preference = 10, mail exchanger = mail.example.com
mail.example.com internet address = 18.104.22.168
Second - Connect to mail server mail.example.com that you just found.
telnet mail.example.com 25
220 mail.example.com ESMTP using Postfix.
helo someaddress.com <- can be your real or a fake host address depending on mail server.
mail from: email@example.com
250 2.1.0 Ok
rcpt to: firstname.lastname@example.org
550 5.1.1 <email@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.)
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!)
221 2.0.0 Bye
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