K-9 Mail
K-9 Mail 是一款功能强大的开源邮件客户端，专为安卓设备设计。它支持 IMAP、POP3 和 SMTP 协议，可以处理多种类型的邮件账户。K-9 Mail 强调隐私保护，提供多层加密功能，是一个灵活且可靠的电子邮件应用。
主要功能：
- 支持 IMAP、POP3 和 SMTP 协议，兼容多种邮件服务。
- 强大的邮件管理功能，包括文件夹支持、邮件搜索和标签分类。
- 提供邮件加密和签名功能，保护邮件内容的安全。
- 支持多账户管理，便于用户处理多个邮件账户。
- 提供自定义设置，用户可以调整邮件通知、界面布局等。
K-9 Mail is a powerful open-source email client designed for Android devices. It supports IMAP, POP3, and SMTP protocols, making it compatible with various email services. K-9 Mail focuses on privacy protection and offers encryption features, making it a flexible and reliable email application.
Main Features:
- Support for IMAP, POP3, and SMTP protocols, compatible with a wide range of email services.
- Advanced email management features including folder support, search, and tagging.
- Encryption and signing of emails to protect the contents.
- Multi-account support for managing multiple email accounts.
- Customizable settings for notifications, layout, and more.