Here we attached ER Diagram of Email Management System. An ER (Entity-Relationship) diagram is a graphical representation of the entities and their relationships in a system. The database design of an Email Management System will depend on the specific requirements of the system, but it typically includes the following tables:

1. Users: This table stores information about the system’s users, including their login credentials, personal information, and contact details.
2. Emails: This table stores information about the emails, such as the sender, recipient, subject, message, and date.
3. Contacts: This table stores information about the user’s contacts, including their name, email address, and contact details.
4. Folders: This table stores information about the different email folders, such as the inbox, sent items, and trash folder, and the relationship between them and the emails.
5. Calendar events: This table stores information about the user’s calendar events, including the start and end time, location, and attendees.
6. Tasks: This table stores information about the user’s tasks, including the task name, due date, and status.
7. Email accounts: This table stores information about the different email accounts that a user might have (e.g. multiple email accounts)
8. Email groups: This table stores information about the different email groups that a user might have (e.g. mailing list)
9. Email filters: This table stores information about the different email filters that a user might have set up, such as filters for spam or certain keywords.
10. Logs: This table stores information about the system’s activity logs, including login attempts, email send/receive, and other actions taken by users.

The project has 5 tables. The tables are login, contacts, user, reminder, address.

The database design will also include relationships between tables and indexes for efficient data retrieval and searching. Additionally, security measures such as encryption and access control will be implemented to ensure the secure handling of sensitive information stored in the database.

An ER (Entity-Relationship) diagram is a graphical representation of the entities and their relationships in a system. An ER diagram of an Email Management System would typically include the following entities:

1. User: Represents the system’s users, including their login credentials, personal information, and contact details.
2. Email: Represents the emails, including the sender, recipient, subject, message, and date.
3. Contact: Represents the user’s contacts, including their name, email address, and contact details.
4. Folder: Represents the different email folders, such as the inbox, sent items, and trash folder.
5. Calendar Event: Represents the user’s calendar events, including the start and end time, location, and attendees.
6. Task: Represents the user’s tasks, including the task name, due date, and status.
7. Email Account: Represents the different email accounts that a user might have.
8. Email Group: Represents the different email groups that a user might have.
9. Email Filter: Represents the different email filters that a user might have set up.
10. Log: Represents the system’s activity logs, including login attempts, email send/receive, and other actions taken by users.

These entities are linked by relationships such as “User has many Emails”, “Email belongs to a Folder”, “User has many Contacts”, “User has many Calendar events”, “User has many Tasks”, “User has many Email Accounts” and so on. The ER diagram would also show the cardinality of the relationships and the attributes of the entities.

It’s worth noting that the ER diagram represents a high-level view of the system, and a deeper understanding of the system and the data flow is required to create a detailed and accurate diagram.