Implemented Email and Hash Service

PostFundManagement.Domain/Models/Email/Attachment.cs

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+namespace PostFundManagement.Domain.Models.Email;
+
+public sealed class Attachment
+{
+    public string? Name { get; set; }
+
+    public Stream? FileStream { get; set; }
+}

PostFundManagement.Domain/Models/Email/Body.cs

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+namespace PostFundManagement.Domain.Models.Email;
+
+public sealed class Body : IDisposable
+{
+    public string? Message { get; set; }
+
+    public ReadOnlyCollection<Attachment>? Attachments { get; set; }
+
+    public BodyProperties Properties { get; set; } = new();
+
+    public void Dispose()
+    {
+        if (Attachments is null) return;
+
+        foreach (var attachment in Attachments!)
+        {
+            if (attachment is not null)
+            {
+                attachment.FileStream!.Close();
+                attachment.FileStream!.Dispose();
+            }
+        }
+
+        GC.SuppressFinalize(this);
+    }
+}

PostFundManagement.Domain/Models/Email/BodyProperties.cs

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+namespace PostFundManagement.Domain.Models.Email;
+
+public sealed class BodyProperties
+{
+    public bool IsHtml { get; set; }
+
+    public bool HasAttachments { get; set; }
+}

PostFundManagement.Domain/Models/Email/Message.cs

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+namespace PostFundManagement.Domain.Models.Email;
+
+public sealed class Message : IDisposable
+{
+    public Party? Sender { get; set; }
+
+    public Party? Recipient { get; set; }
+
+    public string? Subject { get; set; }
+
+    public Body? Body { get; set; }
+
+    public void Dispose()
+    {
+        Body?.Dispose();
+
+        GC.SuppressFinalize(this);
+    }
+}

PostFundManagement.Domain/Models/Email/Party.cs

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+namespace PostFundManagement.Domain.Models.Email;
+
+public sealed class Party
+{
+    public string? Name { get; set; }
+
+    public string? Address { get; set; }
+}

PostFundManagement.Domain/Models/Email/Response.cs

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+namespace PostFundManagement.Domain.Models.Email;
+
+public sealed class Response
+{
+    public int Code { get; set; }
+
+    public string? Error { get; set; }
+
+    public EmailStatuses Status { get; set; }
+
+    private Response(EmailStatuses status, int code = 0, string? error = null)
+    {
+        Status = status;
+        Code = code;
+        Error = error;
+    }
+
+    public static Response Create(EmailStatuses status, int code = 0, string? error = null) =>
+        new(status, code, error);
+}