feat: 增加POP3测试环境

TestDocker/POP3/Dockerfile

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+FROM ubuntu:20.04
+
+# 避免交互式提示
+ENV DEBIAN_FRONTEND=noninteractive
+
+# 安装必要的包
+RUN apt-get update && apt-get install -y \
+    dovecot-pop3d \
+    openssl \
+    && rm -rf /var/lib/apt/lists/*
+
+# 生成SSL证书
+RUN openssl req -x509 -nodes -days 365 -newkey rsa:2048 \
+    -keyout /etc/ssl/private/dovecot.pem \
+    -out /etc/ssl/certs/dovecot.pem \
+    -subj "/C=US/ST=State/L=City/O=Organization/CN=localhost"
+
+# 配置Dovecot
+RUN echo '\
+protocols = pop3\n\
+listen = *\n\
+ssl = yes\n\
+ssl_cert = </etc/ssl/certs/dovecot.pem\n\
+ssl_key = </etc/ssl/private/dovecot.pem\n\
+auth_mechanisms = plain login\n\
+disable_plaintext_auth = no\n\
+mail_location = mbox:~/mail:INBOX=/var/mail/%u\n\
+\n\
+passdb {\n\
+  driver = passwd-file\n\
+  args = scheme=PLAIN username_format=%u /etc/dovecot/passwd\n\
+}\n\
+\n\
+userdb {\n\
+  driver = passwd-file\n\
+  args = username_format=%u /etc/dovecot/users\n\
+}\n\
+' > /etc/dovecot/dovecot.conf
+
+# 创建密码文件
+RUN echo '\
+admin:{PLAIN}admin123\n\
+test:{PLAIN}test123\n\
+root:{PLAIN}root123\n\
+' > /etc/dovecot/passwd
+
+# 创建用户文件
+RUN echo '\
+admin:x:1000:1000::/home/admin:/bin/false\n\
+test:x:1001:1001::/home/test:/bin/false\n\
+root:x:1002:1002::/home/root:/bin/false\n\
+' > /etc/dovecot/users
+
+# 创建必要的目录和权限
+RUN mkdir -p /home/admin /home/test /home/root && \
+    chown 1000:1000 /home/admin && \
+    chown 1001:1001 /home/test && \
+    chown 1002:1002 /home/root
+
+# 暴露端口
+EXPOSE 110 995
+
+# 启动Dovecot
+CMD ["dovecot", "-F"]

TestDocker/POP3/README.txt

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+docker build -t pop3-test .
+docker run -d --name pop3-server -p 110:110 -p 995:995 pop3-test