以下是我当前在端口 587 上连接到 gmail 的 smtp 服务器的代码。发出 STARTTLS 命令后,我将如何完成 TLS 会话的协商并开始发出诸如 AUTH LOGIN 和 MAIL FROM 之类的命令?我省略了 Base64 编码的 gmail 用户名,并将其替换为靠近我的代码底部的 xxxxxxxx。
我从这个程序中得到的输出是:
220 mx.google.com ESMTP y10sm3296641yhd.6
250-mx.google.com 为您服务,[75.66.47.144]
250 尺寸 35882577
250-8BITMIME
250-STARTTLS
250 个增强状态代码
220 2.0.0 准备启动 TLS
from socket import *
import ssl
msg = "\r\n smtp.."
endmsg = "\r\n.\r\n"
# Mailserver hostname and port to be used.
mailserver = ("smtp.gmail.com", 587)
# Create a socket and create an active TCP connection with the mailserver
clientSocket = socket(AF_INET, SOCK_STREAM);
clientSocket.connect(mailserver)
# Read server response
recv = clientSocket.recv(1024)
print recv
if recv[:3] != '220':
print '220 reply not received from server.'
# Send EHLO command and print server response.
ehloCommand = 'EHLO smtp.google.com\r\n'
clientSocket.send(ehloCommand)
recv1 = clientSocket.recv(1024)
print recv1
if recv1[:3] != '250':
print '250 reply not received from server.'
# Send STARTTLS command to server and print server response
command = "STARTTLS\r\n"
clientSocket.send(command)
recv1 = clientSocket.recv(1024)
print recv1
if recv[:3] != '220':
print '220 reply not received from server.'
# SEND AUTH LOGIN command and Base64 encoded username
command = "AUTH LOGIN xxxxxxxxxxxxx\r\n"
clientSocket.send(command)
recv1 = clientSocket.recv(1024)
print recv1