一、应用概述

邮箱检测器： 一个用于快速检测邮箱死活的工具
准确说，是检测邮箱的存活状态，即检测邮箱是存活的还是其他（包括死的，即被封、 不可能的、未注册的）。适用邮箱卖家或买家对邮箱质量进行检测，也适合群发邮件前对目标邮箱进行检测，增加命中率从而减少相应成本。

本邮箱检测器，目前仅支持Google邮箱/Gmail

即将支持的邮箱

二、特色功能

• 核心：不用登陆邮箱，即可检测邮箱存活状态
• 应用轻量级，网页加载很快
• 应用开箱即用，无需进行注册
• 应用支持批量输入，进行批量检测，无检测次数限制
• 应用检测结果直观，可用于死活统计或者死号剔除等多用途
• 应用完全免费，除非不可抗因素，后期会一直维护

三、实现原理

原理是利用smtp，以下是Python代码，理论也可检测其他的国内外邮箱，比如yahoo、outlook、163、qq、yahoo邮箱，待测哦…

<span class="kwd">def</span><span class="pln"> check_by_smtp</span><span class="pun">(</span><span class="pln">gmail</span><span class="pun">):</span><span class="pln">
    domain_name </span><span class="pun">=</span><span class="pln"> gmail</span><span class="pun">.</span><span class="pln">split</span><span class="pun">(</span><span class="str">'@'</span><span class="pun">)[</span><span class="lit">1</span><span class="pun">]</span><span class="pln">
    records </span><span class="pun">=</span><span class="pln"> dns</span><span class="pun">.</span><span class="pln">resolver</span><span class="pun">.</span><span class="pln">resolve</span><span class="pun">(</span><span class="pln">domain_name</span><span class="pun">,</span> <span class="str">'MX'</span><span class="pun">)</span><span class="pln">
    mxRecord </span><span class="pun">=</span><span class="pln"> str</span><span class="pun">(</span><span class="pln">records</span><span class="pun">[</span><span class="lit">0</span><span class="pun">].</span><span class="pln">exchange</span><span class="pun">)</span><span class="pln">

    host </span><span class="pun">=</span><span class="pln"> socket</span><span class="pun">.</span><span class="pln">gethostname</span><span class="pun">()</span><span class="pln">
    server </span><span class="pun">=</span><span class="pln"> smtplib</span><span class="pun">.</span><span class="pln">SMTP</span><span class="pun">()</span><span class="pln">
    server</span><span class="pun">.</span><span class="pln">set_debuglevel</span><span class="pun">(</span><span class="lit">0</span><span class="pun">)</span>

    <span class="com"># SMTP</span><span class="pln">
    server</span><span class="pun">.</span><span class="pln">connect</span><span class="pun">(</span><span class="pln">mxRecord</span><span class="pun">)</span><span class="pln">
    server</span><span class="pun">.</span><span class="pln">helo</span><span class="pun">(</span><span class="pln">host</span><span class="pun">)</span><span class="pln">
    server</span><span class="pun">.</span><span class="pln">mail</span><span class="pun">(</span><span class="str">'me@domain.com'</span><span class="pun">)</span><span class="pln">
    code</span><span class="pun">,</span><span class="pln"> message </span><span class="pun">=</span><span class="pln"> server</span><span class="pun">.</span><span class="pln">rcpt</span><span class="pun">(</span><span class="pln">str</span><span class="pun">(</span><span class="pln">gmail</span><span class="pun">))</span><span class="pln">

    status </span><span class="pun">=</span> <span class="kwd">False</span>
    <span class="kwd">if</span><span class="pln"> code </span><span class="pun">==</span> <span class="lit">250</span><span class="pun">:</span><span class="pln">
        status </span><span class="pun">=</span> <span class="kwd">True</span>
    <span class="kwd">return</span><span class="pln"> status</span>