Initial commit: WpywMail 自建邮件系统：.NET 8 原生 SMTP/IMAP 服务端（DKIM 签名、SPF/DKIM/DMARC 入站校验、SQLite 存储、完整账号体系）、Node 服务端、WinUI 3 客户端与 Web 前端

.env.example

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+MAIL_DOMAIN=wpyw.site
+MAIL_HOSTNAME=mail.wpyw.site
+MAIL_USER=[email protected]
+MAIL_PASSWORD=replace-with-a-long-password
+WEB_PORT=8787
+SMTP_PORT=25
+SUBMISSION_PORT=587
+MAIL_DATA_DIR=H:\\MailData
+SEED_DEMO=false
+
+# Optional outbound SMTP relay. If omitted, the server delivers directly to recipient MX hosts.
+# SMTP_RELAY_HOST=smtp.example.com
+# SMTP_RELAY_PORT=587
+# SMTP_RELAY_USER=username
+# SMTP_RELAY_PASSWORD=password
+# SMTP_RELAY_SECURE=false
+
+# Optional TLS for SMTP STARTTLS/SMTPS. Use a certificate for mail.wpyw.site.
+# SMTP_TLS_KEY=H:\\MailData\\certs\\privkey.pem
+# SMTP_TLS_CERT=H:\\MailData\\certs\\fullchain.pem