# MailService

## Overview

MailService is a simple C# console application that demonstrates how to send plain text and HTML emails using SMTP settings defined in a configuration file. The application reads SMTP settings from a JSON file (`appsettings.json`), and uses these settings to send emails through an `SmtpClient`.

## Features

- Send plain text emails.
- Send HTML emails using an HTML template file.
- Replace placeholders in the HTML template with actual values.

## Project Structure

- `Program.cs`: The main entry point of the application. It reads the SMTP settings from `appsettings.json`, initializes the `MailService`, and sends both plain text and HTML emails.
- `SmtpSettings.cs`: A class that holds the SMTP configuration settings.
- `MailService.cs`: A class that handles the logic for sending emails.
- `appsettings.json`: A JSON file that contains the SMTP configuration settings.
- `email.html`: An HTML template file used for sending HTML emails.

## Configuration

The SMTP settings are stored in the `appsettings.json` file. Here is an example configuration:

```json
{
  "smtpServer": "smtp.office365.com",
  "smtpPort": 587,
  "smtpUser": "user",
  "smtpPassword": "smtpPassword",
  "smtpFrom": "smpt@service.com"
}
```

## Usage

1. Clone the repository and navigate to the project directory.
2. Ensure the `appsettings.json` file is correctly configured with your SMTP settings.
3. Run the application using your preferred IDE or the .NET CLI.

### Sending Emails

The application sends two types of emails:

1. **Plain Text Email**:
   - Sent using the `SendEmailText` method in `MailService`.
   - Example: `await mailService.SendEmailText("user@user.com", "Hello World", "Hello World from C#!");`

2. **HTML Email**:
   - Sent using the `SendEmailHtmlFile` method in `MailService`.
   - The method searches for placeholders in the format `{keyValue}` within the HTML template and replaces them with the corresponding values from the provided dictionary.
   - Example:
     ```csharp
     Dictionary<string, string> replacements = new Dictionary<string, string>
     {
         { "name", "Jonas" }
     };
     await mailService.SendEmailHtmlFile("user@user.com", "Hello World", "email.html", replacements);
     ```