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Example telnet to check if a GMAIL email exists
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| telnet gmail-smtp-in.l.google.com 25 | |
| Connected to gmail-smtp-in.l.google.com. | |
| 220 mx.google.com ESMTP t2si1556751otm.271 - gsmtp | |
| HELO gmail.com | |
| 250 mx.google.com at your service | |
| mail from:<[email protected]> | |
| 250 2.1.0 OK t2si1556751otm.271 - gsmtp | |
| rcpt to:<[email protected]> | |
| 550-5.1.1 The email account that you tried to reach does not exist. Please try | |
| 550-5.1.1 double-checking the recipient's email address for typos or | |
| 550-5.1.1 unnecessary spaces. Learn more at | |
| 550 5.1.1 https://support.google.com/mail/?p=NoSuchUser t2si1556751otm.271 - gsmtp | |
| rcpt to:<[email protected]> | |
| 250 2.1.5 OK t2si1556751otm.271 - gsmtp | |
| data | |
| 354 go ahead, make my day | |
| Subject: My Telnet Test Email | |
| Hello, | |
| This is an email sent by using the telnet command. | |
| Your friend, | |
| Me | |
| . | |
| quit | |
| 221 carlos.local closing connection. Have a jolly good day. | |
| Connection closed by foreign host. |
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