telnet smtp

Type telnet  25,and then press ENTER.

Type EHLO , and then press ENTER.

Type AUTH LOGIN. The server responds with an encrypted prompt for your user name.

Enter your user name encrypted in base 64. You can use one of several tools that are available to encode your user name.

The server responds with an encrypted base 64 prompt for your password. Enter your password encrypted in base 64.

Type MAIL FROM:@domain.com>, and then press ENTER. If the sender is not permitted to send mail, the SMTP server returns an error.

Type RCPT TO:@remotedomain.com>,and then press ENTER.If the recipient is not a valid recipient or the server does not accept mail for this domain, the SMTP server returns an error.

Type DATA.

If desired, type message text, press ENTER, type a period (.), and then press ENTER again.

If mail is working properly, you should see a response similar to the following indicating that mail is queued for delivery:

參考:

https://technet.microsoft.com/en-us/library/aa995718(v=exchg.65).aspx

###############

Connected to smtp.qq.com.

Escape character is '^]'.

220 **********************************************************

ehlo qq

250-CNSH043634 Hello a [10.10.100.65]

250-SIZE 10485760

250-8BITMIME

250-PIPELINING

250-AUTH LOGIN

250 XXXA

auth login

334 VXNlcm5hbWU6

Y3VpemhpbGlhbmczNDQ=      #這位是base64編碼後的賬号

334 UGFzc3dvcmQ6

Q3psMTEwMTIz           #這位是base64編碼後的密碼

235 Authentication succeeded

MAIL FROM:[email protected]

250 OK

RCPT TO:[email protected]

250 Accepted

DATA

354 Enter message, ending with "." on a line by itself

hehhe

ceshi

.

250 OK id=1bRdmd-0008Qm-Nm

Connection closed by foreign host.

#################

本文轉自殘劍部落格51CTO部落格，原文連結http://blog.51cto.com/cuidehua/1829789如需轉載請自行聯系原作者

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