WIP

PlanTempus.Core/Email/EmailModule.cs

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+using Autofac;
+
+namespace PlanTempus.Core.Email;
+
+public class EmailModule : Module
+{
+	public required PostmarkConfiguration PostmarkConfiguration { get; set; }
+
+	protected override void Load(ContainerBuilder builder)
+	{
+		builder.RegisterInstance(PostmarkConfiguration).AsSelf().SingleInstance();
+		builder.RegisterType<PostmarkEmailService>().As<IEmailService>().SingleInstance();
+	}
+}

PlanTempus.Core/Email/IEmailService.cs

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+#nullable enable
+
+namespace PlanTempus.Core.Email;
+
+public interface IEmailService
+{
+	Task<EmailResult> SendVerificationEmailAsync(string toEmail, string userName, string verifyUrl);
+}
+
+public record EmailResult(bool Success, string? MessageId, string? ErrorMessage);

PlanTempus.Core/Email/PostmarkConfiguration.cs

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+#nullable enable
+
+namespace PlanTempus.Core.Email;
+
+public class PostmarkConfiguration
+{
+	public required string ServerToken { get; set; }
+	public required string FromEmail { get; set; }
+	public string? TestToEmail { get; set; }
+}

PlanTempus.Core/Email/PostmarkEmailService.cs

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+using PostmarkDotNet;
+
+namespace PlanTempus.Core.Email;
+
+public class PostmarkEmailService : IEmailService
+{
+	private readonly PostmarkConfiguration _config;
+	private readonly PostmarkClient _client;
+
+	public PostmarkEmailService(PostmarkConfiguration config)
+	{
+		_config = config;
+		_client = new PostmarkClient(config.ServerToken);
+	}
+
+	public async Task<EmailResult> SendVerificationEmailAsync(string toEmail, string userName, string verifyUrl)
+	{
+		var recipient = _config.TestToEmail ?? toEmail;
+
+		var message = new TemplatedPostmarkMessage
+		{
+			From = _config.FromEmail,
+			To = recipient,
+			TemplateAlias = "code-your-own-1",
+			TemplateModel = new Dictionary<string, object>
+			{
+				{ "USER_NAME", userName },
+				{ "VERIFY_URL", verifyUrl }
+			}
+		};
+
+		var response = await _client.SendMessageAsync(message);
+
+		if (response.Status == PostmarkStatus.Success)
+		{
+			return new EmailResult(true, response.MessageID.ToString(), null);
+		}
+
+		return new EmailResult(false, null, response.Message);
+	}
+}