初始化提交，包含完整的邮件系统代码

app/models/mailbox.py

@@ -0,0 +1,50 @@
+from sqlalchemy import Column, Integer, String, Boolean, DateTime, ForeignKey
+from sqlalchemy.orm import relationship
+from datetime import datetime
+import secrets
+
+from . import Base
+
+
+class Mailbox(Base):
+    """邮箱模型"""
+    __tablename__ = 'mailboxes'
+    
+    id = Column(Integer, primary_key=True)
+    address = Column(String(255), unique=True, nullable=False, index=True)
+    domain_id = Column(Integer, ForeignKey('domains.id'), nullable=False)
+    password_hash = Column(String(255), nullable=True)
+    description = Column(String(500), nullable=True)
+    active = Column(Boolean, default=True)
+    api_key = Column(String(64), unique=True, default=lambda: secrets.token_hex(16))
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    last_accessed = Column(DateTime, nullable=True)
+    
+    # 关系
+    domain = relationship("Domain", back_populates="mailboxes")
+    emails = relationship("Email", back_populates="mailbox", cascade="all, delete-orphan")
+    
+    @property
+    def full_address(self):
+        """获取完整邮箱地址 (包含域名)"""
+        return f"{self.address}@{self.domain.name}"
+    
+    def __repr__(self):
+        return f"<Mailbox {self.full_address}>"
+    
+    def to_dict(self):
+        """转换为字典，用于API响应"""
+        return {
+            "id": self.id,
+            "address": self.address,
+            "domain_id": self.domain_id,
+            "domain_name": self.domain.name if self.domain else None,
+            "full_address": self.full_address,
+            "description": self.description,
+            "active": self.active,
+            "created_at": self.created_at.isoformat() if self.created_at else None,
+            "updated_at": self.updated_at.isoformat() if self.updated_at else None,
+            "last_accessed": self.last_accessed.isoformat() if self.last_accessed else None,
+            "email_count": len(self.emails) if self.emails else 0
+        }