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class="container" id="main-content" tabindex="-1"><div class="post"><article class="post-block h-entry"><div class="post-meta p-author h-card visually-hidden"><img class="author-avatar u-photo" src="../favicon.png" alt="Cytrogen"><span class="p-name">Cytrogen</span><a class="u-url" href="https://cytrogen.icu">https://cytrogen.icu</a></div><a class="post-permalink u-url u-uid visually-hidden" href="https://cytrogen.icu/posts/4420.html">永久链接</a><div class="p-summary visually-hidden"><p>我开始在我的笔记本电脑上使用 EndeavourOS＋i3WM 以及 Emacs 了。刚开始使用 Emacs，实在是被它的能力上限所折服，巴不得所有事情都让它来做 —— 例如邮件收发。</p></div><div class="visually-hidden"><a class="p-category" href="../categories/%E7%BC%96%E7%A8%8B%E7%AC%94%E8%AE%B0/">编程笔记</a><a class="p-category" href="../tags/Emacs/">Emacs</a><a class="p-category" href="../tags/Lisp/">Lisp</a></div><h1 class="post-title p-name">Emacs 里配置邮箱服务</h1><div class="post-info"><time class="post-date dt-published" datetime="2026-01-11T05:00:00.000Z">1/11/2026</time><time class="dt-updated visually-hidden" datetime="2026-02-09T17:16:55.009Z"></time></div><div class="post-content e-content"><html><head></head><body><p>我开始在我的笔记本电脑上使用 EndeavourOS＋i3WM 以及 Emacs 了。刚开始使用 Emacs，实在是被它的能力上限所折服，巴不得所有事情都让它来做 —— 例如邮件收发。</p>
<span id="more"></span>
<p>关于邮箱收发，我最终决定使用这样的邮件客户端流：Mu4e 客户端＋mbsync。</p>
<p>首先需要安装以下内容：</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">sudo</span> pacman -S isync msmtp msmtp-mta pass</span><br><span class="line">yay -S mu</span><br></pre></td></tr></tbody></table></figure>
<p>其中，isync 用于 IMAP 同步，mu 是邮件索引器，msmtp 是 SMTP 客户端用于发送，pass 则是密钥管理器。</p>
<p>配置邮件同步，需要创建 <code>~/.mbsyncrc</code>：</p>
<figure class="highlight plaintext"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br></pre></td><td class="code"><pre><span class="line">Create Both</span><br><span class="line">Expunge Both</span><br><span class="line">SyncState *</span><br><span class="line"></span><br><span class="line"># === Gmail ===</span><br><span class="line">IMAPAccount gmail</span><br><span class="line">HOST imap.gmail.com</span><br><span class="line">User 邮箱地址</span><br><span class="line">PassCmd "pass show email/gmail"</span><br><span class="line">TLSType IMAPS</span><br><span class="line">AuthMechs LOGIN</span><br><span class="line"></span><br><span class="line">IMAPStore gmail-remote</span><br><span class="line">Account gmail</span><br><span class="line"></span><br><span class="line">MaildirStore gmail-local</span><br><span class="line">Path ~/Mail/Gmail/</span><br><span class="line">Inbox ~/Mail/Gmail/Inbox</span><br><span class="line">SubFolders Verbatim</span><br><span class="line"></span><br><span class="line">Channel gmail</span><br><span class="line">Far :gmail-remote:</span><br><span class="line">Near :gmail-local:</span><br><span class="line">Patterns *</span><br></pre></td></tr></tbody></table></figure>
<p>在终端初始化目录： <code>mkdir -p ~*Mail*Gmail</code>。</p>
<p>同步前需要生成 GPG 密钥：</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line">gpg --full-generate-key</span><br><span class="line">gpg --list-keys</span><br><span class="line">pass init <GPG ID 或者最后 8 位></span><br><span class="line">pass insert email/gmail</span><br></pre></td></tr></tbody></table></figure>
<p>最后一个命令是交互式的，需要自行粘贴邮箱的密码。对于主流的邮箱，需要输入应用密码，Gmail 和 iCloud 都是这样。</p>
<p>使用 <code>mbsync gmail</code> 来测试单个邮箱的连接。全部一起连接用 <code>mbsync -a</code>。</p>
<h3 id="初始化-mu"><a class="markdownIt-Anchor" href="#初始化-mu"></a> 初始化 mu</h3>
<p>我们需要初始化 mu，告诉它邮件都存放在哪里、哪些是我们的邮箱地址：</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">mu init --maildir=~/Mail \</span><br><span class="line"> --my-address=邮箱地址 \</span><br><span class="line"> --my-address=另一个邮箱地址</span><br></pre></td></tr></tbody></table></figure>
<p>最后建立索引：</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mu index</span><br></pre></td></tr></tbody></table></figure>
<h3 id="将我校邮箱加进来"><a class="markdownIt-Anchor" href="#将我校邮箱加进来"></a> 将我校邮箱加进来</h3>
<p>CUNY 用的是微软的服务，并且关闭了基本认证，必须使用 OAuth2。</p>
<p>我最初的方案是，弄一个脚本处理 OAuth2 握手并自动刷新令牌，也就是 <code>mutt_oauth2.py</code> 脚本（见 neomutt）。这个脚本需要被伪装成 Mozilla Thunderbird，来绕过应用注册审批。</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">mkdir</span> -p ~/.mbsync</span><br><span class="line">curl -L -o ~/.mbsync/mutt_oauth2.py https://raw.githubusercontent.com/neomutt/neomutt/master/contrib/oauth2/mutt_oauth2.py</span><br><span class="line"><span class="built_in">chmod</span> -x ~/.mbsync/mutt_oauth2.py</span><br></pre></td></tr></tbody></table></figure>
<p>然后这么调用：</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">python ~/.mbsync/mutt_oauth2.py ~/.mbsync/cuny_token --verbose --authorize --provider microsoft --client-id 9e5f94bc-e8a4-4e73-b8be-63364c29d753 --authflow authcode --email <你的邮箱地址></span><br></pre></td></tr></tbody></table></figure>
<p>出现 Client Secret 时直接按回车，复制终端里给的 URL，最好是在无痕浏览器里登录。登录完会跳转到一个页面，赶紧复制 URL 下来，否则过几秒会跳转到警告页面。这个 URL 里有个 <code>code</code> 参数，复制下来（注意后面的 <code>session_state</code> 参数，删掉），输入到终端里……</p>
<p>然后你会收到 <em>User is authorized but not connected</em> 的消息。</p>
<p>为什么会这样呢？我们的 OAuth2 配置是没有问题的，但是 CUNY IT 部门把邮箱的 IMAP 和 POP 协议都禁用、不让用在应用上。</p>
<p>解决方法是，用 DavMail 在本地机器开启一个 IMAP 端口，mbsync 会连接到它，发送的请求会被转换成 Microsoft EWS 协议，也是 Outlook 网页版和官方客户端使用的协议。DavMail 会向微软的服务器请求数据，并伪装成 IMAP 返回给 mbsync。</p>
<p>创建 <code>~/.davmail.properties</code>：</p>
<figure class="highlight plaintext"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line">davmail.mode=O365Manual</span><br><span class="line">davmail.uri=https://outlook.office365.com/EWS/Exchange.asmx</span><br><span class="line">davmail.imapPort=1143</span><br><span class="line">davmail.smtpPort=1025</span><br><span class="line">davmail.ldapPort=1389</span><br><span class="line">davmail.popPort=1110</span><br><span class="line">davmail.bindAddress=127.0.0.1</span><br><span class="line">davmail.oauth.clientId=d3590ed6-52b3-4102-aeff-aad2292ab01c</span><br><span class="line">davmail.oauth.redirectUri=urn:ietf:wg:oauth:2.0:oob</span><br><span class="line">davmail.tokenFilePath=davmail.properties</span><br><span class="line">davmail.ssl.nosecurecaldav=false</span><br><span class="line">log4j.rootLogger=WARN</span><br><span class="line">davmail.logFilePath=/var/log/davmail.log</span><br><span class="line">davmail.keepDelay=30</span><br></pre></td></tr></tbody></table></figure>
<p><code>davmail.oauth.clientId</code> 里的内容是微软 Outlook 官方客户端的 ID。<br>
用 <code>davmail ~/.davmail.properties</code> 启动，它会出现一个 URL，也是建议用无痕浏览器使用。唯一的区别是，这次登录后会一直卡着，一定要在登录前打开 Inspect 的 Network 标签页，里面会有一个 302 状态码的请求，location 值里的 URL 有个 <code>code</code> 参数，取出来粘贴到 DavMail 里。</p>
<p>在另一个终端里运行 mbsync：</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">mbsync cuny</span><br></pre></td></tr></tbody></table></figure>
<h3 id="发送邮件"><a class="markdownIt-Anchor" href="#发送邮件"></a> 发送邮件</h3>
<p>我们需要使用 msmtp 这个外部程序来发信。</p>
<p>如果你有着需要使用 DavMail 才能连接上的邮箱地址，msmtp 也需要通过 DavMail 发送邮件。创建 <code>~/.msmtprc</code>：</p>
<figure class="highlight plaintext"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">defaults</span><br><span class="line">auth on</span><br><span class="line">tls off</span><br><span class="line">tls_starttls off</span><br><span class="line">logfile ~/.msmtp.log</span><br><span class="line"></span><br><span class="line">account cuny</span><br><span class="line">host 127.0.0.1</span><br><span class="line">port 1025</span><br><span class="line">from 邮箱地址</span><br><span class="line">user 邮箱地址</span><br><span class="line">password "随便写"</span><br><span class="line"></span><br><span class="line">account gmail</span><br><span class="line">host smtp.gmail.com</span><br><span class="line">port 587</span><br><span class="line">auth on</span><br><span class="line">tls on</span><br><span class="line">tls_starttls on</span><br><span class="line">user 邮箱地址</span><br><span class="line">from 邮箱地址</span><br><span class="line">passwordeval "pass show email/gmail"</span><br><span class="line">tls_trust_file /etc/ssl/certs/ca-certificates.crt</span><br></pre></td></tr></tbody></table></figure>
<p>设置文件的权限：</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">chmod</span> 600 ~/.msmtprc</span><br></pre></td></tr></tbody></table></figure>
<p>你可以这样测试发送：</p>
<figure class="highlight bash"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="built_in">echo</span> <span class="string">"This is a test email from msmtp via DavMail."</span> | msmtp --debug --account=发的账户 另一个收的邮箱</span><br></pre></td></tr></tbody></table></figure>
<h3 id="配置-emacs"><a class="markdownIt-Anchor" href="#配置-emacs"></a> 配置 Emacs</h3>
<p>现在我们的邮件系统由三个组件协同工作：</p>
<ul>
<li>mbsync 负责收</li>
<li>mu4e 负责界面和索引</li>
<li>msmtp 负责发</li>
</ul>
<p>我的方案是，在一个配置文件内写好所有的邮箱账号信息，例如这样：</p>
<figure class="highlight lisp"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">(<span class="symbol">:name</span> <span class="string">"CUNY"</span> <span class="comment">; 显示名称</span></span><br><span class="line"> <span class="symbol">:email</span> <span class="string">"邮箱地址"</span></span><br><span class="line"> <span class="symbol">:fullname</span> <span class="string">"blabla"</span> <span class="comment">; 发件人名</span></span><br><span class="line"> <span class="symbol">:maildir</span> <span class="string">"CUNY"</span> <span class="comment">; ~/Mail/ 下的文件夹</span></span><br><span class="line"> <span class="symbol">:inbox</span> <span class="string">"Inbox"</span> <span class="comment">; 收件箱路径</span></span><br><span class="line"> <span class="symbol">:sent</span> <span class="string">"Sent"</span> <span class="comment">; 已发送</span></span><br><span class="line"> <span class="symbol">:drafts</span> <span class="string">"Drafts"</span> <span class="comment">; 草稿</span></span><br><span class="line"> <span class="symbol">:trash</span> <span class="string">"Trash"</span> <span class="comment">; 垃圾箱</span></span><br><span class="line"> <span class="symbol">:archive</span> <span class="string">"Archive"</span>) <span class="comment">; 归档</span></span><br></pre></td></tr></tbody></table></figure>
<p>多账号就是一个列表： <code>(账号1 账号2 ...)</code>。</p>
<p>为了让 mu4e 支持多账号，需要写一个函数自动生成 context。</p>
<figure class="highlight lisp"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">(<span class="name">defun</span> my/email--make-context (<span class="name">account</span>)</span><br><span class="line"> (<span class="name">make-mu4e-context</span></span><br><span class="line"> <span class="symbol">:name</span> (<span class="name">plist-get</span> account <span class="symbol">:name</span>)</span><br><span class="line"> <span class="symbol">:match-func</span> (<span class="name">lambda</span> (<span class="name">msg</span>)</span><br><span class="line"> (<span class="name">string-prefix-p</span> <span class="string">"/CUNY"</span> (<span class="name">mu4e-message-field</span> msg <span class="symbol">:maildir</span>)))</span><br><span class="line"> <span class="symbol">:vars</span> `((user-mail-address . ,(plist-get account :email))</span><br><span class="line"> (mu4e-sent-folder . <span class="string">"/CUNY/Sent"</span>)</span><br><span class="line"> (mu4e-drafts-folder . <span class="string">"/CUNY/Drafts"</span>)</span><br><span class="line"> ...)))</span><br></pre></td></tr></tbody></table></figure>
<p>mu4e 很大，建议用 <code>with-eval-after-load</code> 延迟配置：</p>
<figure class="highlight lisp"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">(<span class="name">with-eval-after-load</span> 'mu4e</span><br><span class="line"> (<span class="name">setq</span> mu4e-maildir <span class="string">"~/Mail"</span>)</span><br><span class="line"> (<span class="name">setq</span> mu4e-get-mail-command <span class="string">"mbsync -a"</span>))</span><br></pre></td></tr></tbody></table></figure>
<p>也可以使用 <code>--read-envelope-from</code> 让 msmtp 自动从邮件头的 <code>From:</code> 字段选择正确的账号发送：</p>
<figure class="highlight lisp"><table><tbody><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">(<span class="name">setq</span> sendmail-program <span class="string">"/usr/bin/msmtp"</span>)</span><br><span class="line">(<span class="name">setq</span> message-send-mail-function 'message-send-mail-with-sendmail)</span><br><span class="line">(<span class="name">setq</span> message-sendmail-extra-arguments '(<span class="string">"--read-envelope-from"</span>))</span><br></pre></td></tr></tbody></table></figure>
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