In a professional setting, various types of official mails are used for communication. Here are some common types:

Inquiry Mail
Purpose: To request information or clarification.
Example: Asking for details about a product or service.

Complaint Mail
Purpose: To express dissatisfaction or report an issue.
Example: Reporting a defect in a purchased item.

Order Mail
Purpose: To place an order for goods or services.
Example: Ordering office supplies from a vendor.

Confirmation Mail
Purpose: To confirm the receipt of information, goods, or services.
Example: Confirming the details of a scheduled meeting.

Acknowledgment Mail
Purpose: To acknowledge the receipt of a mail or document.
Example: Acknowledging the receipt of a job application.

Approval Mail
Purpose: To give formal approval for a request or proposal.
Example: Approving a budget proposal.

Rejection Mail
Purpose: To formally reject a request or proposal.
Example: Rejecting a leave application.

Invitation Mail
Purpose: To invite individuals to an event or meeting.
Example: Inviting staff to a company seminar.

Follow-Up Mail
Purpose: To follow up on previous communications or actions.
Example: Following up on a pending payment.

Notice Mail
Purpose: To inform about important announcements or changes.
Example: Notifying staff about a policy change.

Reminder Mail
Purpose: To remind someone of an upcoming event or deadline.
Example: Reminding employees about a scheduled meeting.

Thank You Mail
Purpose: To express gratitude.
Example: Thanking a client for their business.

Apology Mail
Purpose: To apologize for a mistake or inconvenience.
Example: Apologizing for a delayed delivery.

Circular Mail
Purpose: To disseminate information to a large group.
Example: Sending a company-wide update on new HR policies.

Memo Mail
Purpose: To communicate internally within an organization.
Example: Informing employees about an upcoming internal audit.

Offer Mail
Purpose: To make an offer for employment or business.
Example: Sending a job offer letter to a candidate.

Resignation Mail
Purpose: To formally resign from a position.
Example: An employee submitting their resignation notice.

Proposal Mail
Purpose: To propose a new idea or project.
Example: Proposing a new marketing strategy to the management.

Inquiry Response Mail
Purpose: To respond to an inquiry mail.
Example: Providing details about a product after receiving an inquiry.

Report Mail
Purpose: To send reports or summaries.
Example: Sending a monthly sales report to the management.

Request Mail
Purpose: To request approval or resources.
Example: Requesting leave approval from a manager.

Introduction Mail
Purpose: To introduce oneself or another person.
Example: Introducing a new team member to the rest of the staff.

Meeting Mail
Purpose: To schedule, reschedule, or cancel a meeting.
Example: Scheduling a project status meeting.

These types of official mails help ensure clear, formal, and effective communication in a professional environment.