diff --git a/Mail/IMailService.cs b/Mail/IMailService.cs
new file mode 100644
index 0000000..53c7222
--- /dev/null
+++ b/Mail/IMailService.cs
@@ -0,0 +1,11 @@
+using Promact.Core.Models;
+using System.Threading.Tasks;
+
+namespace Promact.Core.Mail
+{
+    public interface IMailService
+    {
+        Task<SendEmailResult> SendEmailAsync(SimpleEmailRequest simpleEmailRequest);
+        Task<SendEmailResult> SendTemplatedEmailAsync(TemplatedEmailRequest templatedEmailRequest);
+    }
+}
diff --git a/Models/SendEmailResult.cs b/Models/SendEmailResult.cs
new file mode 100644
index 0000000..aa1956d
--- /dev/null
+++ b/Models/SendEmailResult.cs
@@ -0,0 +1,8 @@
+namespace Promact.Core.Models
+{
+    public class SendEmailResult
+    {
+        public bool IsSuccess { get; set; }
+        public string? ErrorMessage { get; set; }
+    }
+}
diff --git a/Models/SimpleEmailRequest.cs b/Models/SimpleEmailRequest.cs
new file mode 100644
index 0000000..cc6a3be
--- /dev/null
+++ b/Models/SimpleEmailRequest.cs
@@ -0,0 +1,6 @@
+namespace Promact.Core.Models
+{
+    public class SimpleEmailRequest
+    {
+    }
+}
diff --git a/Models/TemplatedEmailRequest.cs b/Models/TemplatedEmailRequest.cs
new file mode 100644
index 0000000..f53d003
--- /dev/null
+++ b/Models/TemplatedEmailRequest.cs
@@ -0,0 +1,6 @@
+namespace Promact.Core.Models
+{
+    public class TemplatedEmailRequest
+    {
+    }
+}
diff --git a/Promact.Core.csproj b/Promact.Core.csproj
new file mode 100644
index 0000000..b4b43f4
--- /dev/null
+++ b/Promact.Core.csproj
@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netstandard2.1</TargetFramework>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>
diff --git a/Promact.Core.sln b/Promact.Core.sln
new file mode 100644
index 0000000..17981bd
--- /dev/null
+++ b/Promact.Core.sln
@@ -0,0 +1,25 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.8.34330.188
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Promact.Core", "Promact.Core.csproj", "{CF4E708F-CCAF-4929-9ED4-05879CC1AEA3}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{CF4E708F-CCAF-4929-9ED4-05879CC1AEA3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{CF4E708F-CCAF-4929-9ED4-05879CC1AEA3}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{CF4E708F-CCAF-4929-9ED4-05879CC1AEA3}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{CF4E708F-CCAF-4929-9ED4-05879CC1AEA3}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4E502DDF-5C02-4E8E-92F3-B5FEE417C357}
+	EndGlobalSection
+EndGlobal