Added new E-Mail Api

Wave/Data/SmtpConfiguration.cs

@@ -7,5 +7,6 @@ public class SmtpConfiguration {
     public required string Password { get; init; } 
     public required string SenderEmail { get; init; }
     public required string SenderName { get; init; }
+	public required string ServiceEmail { get; init; }
     public bool Ssl { get; init; } = true;  
 }

Wave/Program.cs

@@ -124,6 +124,7 @@
 var smtpConfig = builder.Configuration.GetSection("Email:Smtp");
 if (smtpConfig.Exists()) {
 	builder.Services.Configure<SmtpConfiguration>(smtpConfig);
+	builder.Services.AddKeyedScoped<IEmailService, LiveEmailService>("live");
 	builder.Services.AddScoped<IEmailSender, SmtpEmailSender>();
 	builder.Services.AddScoped<IAdvancedEmailSender, SmtpEmailSender>();
 	builder.Services.AddScoped<IEmailSender<ApplicationUser>, SmtpEmailSender>();
@@ -132,6 +133,8 @@
 	logMessages.Add("No Email provider configured.");
 }
 
+builder.Services.AddScoped<EmailFactory>();
+
 builder.Services.AddSingleton<IMessageDisplay, MessageService>();
 builder.Services.AddSingleton<FileSystemService>();
 builder.Services.AddSingleton<EmailTemplateService>();

Wave/Services/EmailFactory.cs

@@ -0,0 +1,67 @@
+using System.Collections.Frozen;
+using System.Net;
+using System.Text;
+using Microsoft.Extensions.Options;
+using MimeKit;
+using Wave.Data;
+using Wave.Utilities;
+
+namespace Wave.Services;
+
+public class EmailFactory(IOptions<Customization> customizations, EmailTemplateService templateService) {
+	private Customization Customizations { get; } = customizations.Value;
+	private EmailTemplateService TemplateService { get; } = templateService;
+
+	public async ValueTask<IEmail> CreateDefaultEmail(string receiverMail, string? receiverName, string subject, string title, string bodyHtml) {
+		(string host, string logo) = GetStaticData();
+		string body = await TemplateService.DefaultAsync(host, logo, title, bodyHtml);
+
+		return new StaticEmail(receiverMail, receiverName, subject, title, body, FrozenDictionary<string, string>.Empty);
+	}
+
+	public async ValueTask<IEmail> CreateSubscribedEmail(EmailSubscriber subscriber, string browserLink, string subject, string title, string bodyHtml, string role = "unknown") {
+		(string host, string logo) = GetStaticData();
+
+		string unsubscribeLink = await GetUnsubscribeLink(host, subscriber.Id, role);
+		string body = await TemplateService.NewsletterAsync(host, browserLink, logo, title, bodyHtml, unsubscribeLink);
+
+		return new StaticEmail(subscriber.Email, subscriber.Name, subject, title, body, new Dictionary<string, string>{
+			{HeaderId.ListUnsubscribe.ToHeaderName(), $"<{unsubscribeLink}>"},
+			{HeaderId.ListUnsubscribePost.ToHeaderName(), "One-Click"}
+		}.ToFrozenDictionary());
+	}
+
+	public async ValueTask<IEmail> CreateWelcomeEmail(EmailSubscriber subscriber, IEnumerable<EmailNewsletter> articles, string subject, string title, string bodyHtml) {
+		(string host, string logo) = GetStaticData();
+
+		string articlePartial = await TemplateService.GetPartialAsync("email-article");
+		var articlesHtml = new StringBuilder("");
+		foreach (var n in articles) {
+			string articleLink = ArticleUtilities.GenerateArticleLink(n.Article, new Uri(Customizations.AppUrl, UriKind.Absolute));
+			articlesHtml.AppendFormat(
+				articlePartial, 
+				n.Article.Title, n.Article.Author.Name, n.Article.Body[..Math.Min(250, n.Article.Body.Length)], articleLink);
+		}
+		
+		string unsubscribeLink = await GetUnsubscribeLink(host, subscriber.Id, "welcome");
+		string body = TemplateService.Welcome(host, logo, title, bodyHtml, unsubscribeLink, articlesHtml.ToString());
+		
+		return new StaticEmail(subscriber.Email, subscriber.Name, subject, title, body, new Dictionary<string, string>{
+			{HeaderId.ListUnsubscribe.ToHeaderName(), $"<{unsubscribeLink}>"},
+			{HeaderId.ListUnsubscribePost.ToHeaderName(), "One-Click"}
+		}.ToFrozenDictionary());
+	}
+
+	private (string host, string logo) GetStaticData() {
+		var host = new Uri(string.IsNullOrWhiteSpace(Customizations.AppUrl) ? "" : Customizations.AppUrl); // TODO get link
+		string logo = !string.IsNullOrWhiteSpace(Customizations.LogoLink)
+			? Customizations.LogoLink
+			: new Uri(host, "/img/logo.png").AbsoluteUri;
+		return (host.AbsoluteUri, logo);
+	}
+
+	private async ValueTask<string> GetUnsubscribeLink(string host, Guid subscriberId, string role) {
+		(string user, string token) = await TemplateService.CreateConfirmTokensAsync(subscriberId, "unsubscribe-"+role, TimeSpan.FromDays(30));
+		return new Uri(new Uri(host), $"/Email/Unsubscribe?newsletter={role}&user={WebUtility.UrlEncode(user)}&token={WebUtility.UrlEncode(token)}").AbsoluteUri;
+	}
+}

Wave/Services/EmailNotSendException.cs

@@ -0,0 +1,3 @@
+namespace Wave.Services;
+
+public class EmailNotSendException(string message, Exception exception) : ApplicationException(message, exception);

Wave/Services/EmailTemplateService.cs

@@ -51,6 +51,15 @@ public enum Constants {
 		});
 	}
 
+	public ValueTask<string> DefaultAsync(string home, string logoLink, string title, string body) {
+		return ProcessAsync("default", new Dictionary<Constants, object?> {
+			{Constants.HomeLink, home},
+			{Constants.ContentLogo, logoLink},
+			{Constants.ContentTitle, title},
+			{Constants.ContentBody, body}
+		});
+	}
+
 	public string Newsletter(string home, string browserUrl, string logoLink, string title, string body, string unsubscribe) {
 		return Process("newsletter", new Dictionary<Constants, object?> {
 			{ Constants.HomeLink, home },
@@ -61,6 +70,16 @@ public enum Constants {
 			{ Constants.EmailUnsubscribeLink, unsubscribe }
 		});
 	}
+	public ValueTask<string> NewsletterAsync(string home, string browserUrl, string logoLink, string title, string body, string unsubscribe) {
+		return ProcessAsync("newsletter", new Dictionary<Constants, object?> {
+			{ Constants.HomeLink, home },
+			{ Constants.BrowserLink, browserUrl },
+			{ Constants.ContentLogo, logoLink },
+			{ Constants.ContentTitle, title },
+			{ Constants.ContentBody, body },
+			{ Constants.EmailUnsubscribeLink, unsubscribe }
+		});
+	}
 
 	public string Welcome(string home, string logoLink, string title, string body, string unsubscribe, string articles) {
 		return Process("welcome", new Dictionary<Constants, object?> {
@@ -77,15 +96,7 @@ public enum Constants {
 		FileSystem.GetEmailTemplate("default", DefaultTemplates["default"]);
 		FileSystem.GetEmailTemplate("newsletter", DefaultTemplates["newsletter"]);
 		FileSystem.GetEmailTemplate("welcome", DefaultTemplates["welcome"]);
-		FileSystem.GetPartialTemplateAsync("email-article",
+		FileSystem.GetPartialTemplate("email-article", DefaultPartials["email-article"]);
-			"""
-			<div style="padding: 10px; background: #9f9f9f; color: #fff; margin-bottom: 10px; border-radius: 2px">
-			  <h3 style="margin-top: 0;">{0}</h3>
-			  <small>{1}</small>
-			  <p>{2}...</p>
-			  <a href="{3}">Link</a>
-			</div>
-			""");
 	}
 
 	public string ApplyTokens(string template, Func<string, string?> replacer) {
@@ -97,6 +108,17 @@ public enum Constants {
 			       DefaultTemplates.TryGetValue(templateName, out string? s) ? s : null) 
 		       ?? throw new ApplicationException("Failed to retrieve mail template " + templateName + ".");
 	}
+	public async ValueTask<string> GetPartialAsync(string partialName) {
+		return await FileSystem.GetPartialTemplateAsync(partialName, 
+					DefaultTemplates.TryGetValue(partialName, out string? s) ? s : null) 
+				?? throw new ApplicationException("Failed to retrieve mail template " + partialName + ".");
+	}
+	
+	public async ValueTask<string> GetTemplateAsync(string templateName) {
+		return await FileSystem.GetEmailTemplateAsync(templateName, 
+					DefaultTemplates.TryGetValue(templateName, out string? s) ? s : null) 
+				?? throw new ApplicationException("Failed to retrieve mail template " + templateName + ".");
+	}
 
 	public string CompileTemplate(string template, string templateName = "unknown") {
 		var options = new MjmlOptions { Beautify = false };
@@ -117,6 +139,12 @@ public enum Constants {
 		return CompileTemplate(template, templateName);
 	}
 	
+	public async ValueTask<string> ProcessAsync(string templateName, Dictionary<Constants, object?> data) {
+		string template = ApplyTokens(await GetTemplateAsync(templateName), token => 
+			data.TryGetValue(Enum.Parse<Constants>(token, true), out object? v) ? v?.ToString() : null);
+		return CompileTemplate(template, templateName);
+	}
+
 	[GeneratedRegex(@"(\[\[.*?\]\])", 
 		RegexOptions.IgnoreCase | RegexOptions.Compiled | RegexOptions.Singleline | RegexOptions.CultureInvariant)]
 	private static partial Regex MyRegex();
@@ -266,4 +294,19 @@ public enum Constants {
 			 """
 		}
 	};
+
+	private Dictionary<string, string> DefaultPartials { get; } = new()
+	{
+		{
+			"email-article",
+			"""
+			<div style="padding: 10px; background: #9f9f9f; color: #fff; margin-bottom: 10px; border-radius: 2px">
+			  <h3 style="margin-top: 0;">{0}</h3>
+			  <small>{1}</small>
+			  <p>{2}...</p>
+			  <a href="{3}">Link</a>
+			</div>
+			"""
+		}
+	};
 }

Wave/Services/FileSystemService.cs

@@ -7,7 +7,7 @@ public class FileSystemService(ILogger<FileSystemService> logger) {
 
 	private ILogger<FileSystemService> Logger { get; } = logger;
 
-	public Task<string?> GetEmailTemplateAsync(string name, string? defaultTemplate = null) {
+	public ValueTask<string?> GetEmailTemplateAsync(string name, string? defaultTemplate = null) {
 		string path = Path.Combine(ConfigurationDirectory, "templates", "email", name + ".mjml");
 		return GetFileContentAsync(path, defaultTemplate);
 	}
@@ -17,7 +17,7 @@ public class FileSystemService(ILogger<FileSystemService> logger) {
 		return GetFileContent(path, defaultTemplate);
 	}
 	
-	public Task<string?> GetPartialTemplateAsync(string name, string? defaultTemplate = null) {
+	public ValueTask<string?> GetPartialTemplateAsync(string name, string? defaultTemplate = null) {
 		string path = Path.Combine(ConfigurationDirectory, "templates", "partials", name + ".html");
 		return GetFileContentAsync(path, defaultTemplate);
 	}
@@ -47,7 +47,7 @@ public class FileSystemService(ILogger<FileSystemService> logger) {
 			return defaultContent;
 		}
 	}
-	private async Task<string?> GetFileContentAsync(string path, string? defaultContent = null) {
+	private async ValueTask<string?> GetFileContentAsync(string path, string? defaultContent = null) {
 		if (!File.Exists(path)) {
 			try {
 				Directory.CreateDirectory(Path.GetDirectoryName(path)!);

Wave/Services/IAdvancedEmailSender.cs

@@ -3,6 +3,7 @@
 
 namespace Wave.Services;
 
+[Obsolete]
 public interface IAdvancedEmailSender : IEmailSender {
 	Task SendEmailAsync(string email, string? name, string subject, string htmlMessage);
 	Task SendDefaultMailAsync(string receiverMail, string? receiverName, string subject, string title, string bodyHtml);

Wave/Services/IEmail.cs

@@ -0,0 +1,12 @@
+using System.Collections.Frozen;
+
+namespace Wave.Services;
+
+public interface IEmail {
+	string ReceiverEmail { get; }
+	string? ReceiverName { get; }
+	string Subject { get; }
+	string Title { get; }
+	string ContentHtml { get; }
+	FrozenDictionary<string, string> Headers { get; }
+}

Wave/Services/IEmailService.cs

@@ -0,0 +1,8 @@
+namespace Wave.Services;
+
+public interface IEmailService : IAsyncDisposable {
+	ValueTask Connect(CancellationToken cancellation);
+	ValueTask Disconnect(CancellationToken cancellation);
+
+	ValueTask SendEmailAsync(IEmail email);
+}

Wave/Services/LiveEmailService.cs

@@ -0,0 +1,74 @@
+using MailKit.Net.Smtp;
+using MailKit.Security;
+using Microsoft.Extensions.Options;
+using MimeKit;
+using Wave.Data;
+
+namespace Wave.Services;
+
+public class LiveEmailService(ILogger<LiveEmailService> logger, IOptions<SmtpConfiguration> configuration) : IEmailService {
+	private ILogger<LiveEmailService> Logger { get; } = logger;
+	private SmtpConfiguration Configuration { get; } = configuration.Value;
+
+	private SmtpClient? Client { get; set; }
+
+	public async ValueTask DisposeAsync() {
+		GC.SuppressFinalize(this);
+		await Disconnect(CancellationToken.None);
+	}
+
+	public async ValueTask Connect(CancellationToken cancellation) {
+		if (Client is not null) return;
+
+		try {
+			Client = new SmtpClient();
+			await Client.ConnectAsync(Configuration.Host, Configuration.Port,
+				Configuration.Ssl ? SecureSocketOptions.SslOnConnect : SecureSocketOptions.None, cancellation);
+
+			if (!string.IsNullOrWhiteSpace(Configuration.Username)) {
+				await Client.AuthenticateAsync(Configuration.Username, Configuration.Password, cancellation);
+			}
+		} catch (Exception ex) {
+			Logger.LogError(ex, "Error connecting to SMTP Client.");
+			Client?.Dispose();
+			throw;
+		}
+	}
+
+	public async ValueTask Disconnect(CancellationToken cancellation) {
+		if (Client is null) return;
+		await Client.DisconnectAsync(true, cancellation);
+		Client.Dispose();
+		Client = null;
+	}
+
+	public async ValueTask SendEmailAsync(IEmail email) {
+		try {
+			if (Client is null) throw new ApplicationException("Not connected.");
+
+			var message = new MimeMessage {
+				From = { new MailboxAddress(Configuration.SenderName, Configuration.SenderEmail) },
+				To = { new MailboxAddress(email.ReceiverName, email.ReceiverEmail) },
+				Subject = email.Subject
+			};
+			var builder = new BodyBuilder { HtmlBody = email.ContentHtml };
+			message.Body = builder.ToMessageBody();
+			foreach ((string id, string value) in email.Headers) {
+				if (id == HeaderId.ListUnsubscribe.ToHeaderName()) {
+					message.Headers.Add(HeaderId.ListId, $"<mailto:{Configuration.ServiceEmail ?? Configuration.SenderEmail}>");
+				}
+				message.Headers.Add(id, value);
+			}
+
+			try {
+				await Client.SendAsync(message);
+				Logger.LogInformation("Successfully send mail to {email} (subject: {subject}).",
+					email.ReceiverEmail, email.Subject);
+			} catch (Exception ex) {
+				throw new EmailNotSendException("Failed Email send.", ex);
+			}
+		} catch (Exception ex) {
+			Logger.LogError(ex, "Error sending E-Mail");
+		}
+	}
+}

Wave/Services/SmtpEmailSender.cs

@@ -1,138 +1,65 @@
-using System.Net;
+using Microsoft.AspNetCore.Identity;
-using System.Text;
-using MailKit.Net.Smtp;
-using MailKit.Security;
-using Microsoft.AspNetCore.Identity;
-using Microsoft.Extensions.Options;
-using MimeKit;
 using Wave.Data;
-using Wave.Utilities;
-using Uri = System.Uri;
 
 namespace Wave.Services;
 
-public class SmtpEmailSender(ILogger<SmtpEmailSender> logger, IOptions<SmtpConfiguration> config, IOptions<Customization> customizations, EmailTemplateService templateService, FileSystemService fileSystemService) : IEmailSender<ApplicationUser>, IAdvancedEmailSender {
+public class SmtpEmailSender(EmailFactory email, [FromKeyedServices("live")]IEmailService emailService) : IEmailSender<ApplicationUser>, IAdvancedEmailSender, IAsyncDisposable {
-	private ILogger<SmtpEmailSender> Logger { get; } = logger;
+	private EmailFactory Email { get; } = email;
-	private SmtpConfiguration Configuration { get; } = config.Value;
+	private IEmailService EmailService { get; } = emailService;
-	private Customization Customizations { get; } = customizations.Value;
+
-	private FileSystemService FileSystemService { get; } = fileSystemService;
+	#region IEmailSenderAsync<ApplicationUser>
-	private EmailTemplateService TemplateService { get; } = templateService;
 	
 	public Task SendConfirmationLinkAsync(ApplicationUser user, string email, string confirmationLink) =>
-		SendEmailAsync(email, "Confirm your email",
+		SendEmailAsync(email, user.FullName, "Confirm your email",
 			$"Please confirm your account by <a href='{confirmationLink}'>clicking here</a>.");
 
 	public Task SendPasswordResetLinkAsync(ApplicationUser user, string email, string resetLink) =>
-		SendEmailAsync(email, "Reset your password",
+		SendEmailAsync(email, user.FullName, "Reset your password",
 			$"Please reset your password by <a href='{resetLink}'>clicking here</a>.");
 
 	public Task SendPasswordResetCodeAsync(ApplicationUser user, string email, string resetCode) =>
-		SendEmailAsync(email, "Reset your password",
+		SendEmailAsync(email, user.FullName, "Reset your password",
 			$"Please reset your password using the following code: {resetCode}");
 
+	#endregion
+
+	#region IEmailSender 
 	
 	public Task SendEmailAsync(string email, string subject, string htmlMessage) {
 		return SendEmailAsync(email, null, subject, htmlMessage);
 	}
 
-	public Task SendEmailAsync(string email, string? name, string subject, string htmlMessage)
+	#endregion
-		=> SendEmailAsync(email, name, subject, htmlMessage, []);
-	public async Task SendEmailAsync(string email, string? name, string subject, string htmlMessage, params Header[] header) {
-		try {
-			var message = new MimeMessage {
-				From = {new MailboxAddress(Configuration.SenderName, Configuration.SenderEmail)},
-				To = { new MailboxAddress(name, email) },
-				Subject = subject
-			};
 
-			var builder = new BodyBuilder {
-				HtmlBody = htmlMessage
-			};
 
-			message.Body = builder.ToMessageBody();
+	public async Task SendEmailAsync(string email, string? name, string subject, string htmlMessage) {
-			foreach (var h in header) {
+		await EmailService.Connect(CancellationToken.None);
-				message.Headers.Add(h);
+		await EmailService.SendEmailAsync(await Email.CreateDefaultEmail(email, name, subject, subject, htmlMessage));
-			}
+		await EmailService.Disconnect(CancellationToken.None);
-
-			using var client = new SmtpClient();
-			await client.ConnectAsync(Configuration.Host, Configuration.Port, 
-				Configuration.Ssl ? SecureSocketOptions.SslOnConnect : SecureSocketOptions.None);
-			if (!string.IsNullOrWhiteSpace(Configuration.Username)) {
-				await client.AuthenticateAsync(Configuration.Username, Configuration.Password);
-			}
-
-			try {
-				await client.SendAsync(message);
-			} catch (Exception ex) {
-				throw new EmailNotSendException("Failed Email send.", ex);
-			}
-			await client.DisconnectAsync(true);
-			Logger.LogInformation("Successfully send mail to {email} (subject: {subject}).", email, subject);
-		} catch (Exception ex) {
-			Logger.LogError(ex, "Error sending E-Mail");
-			throw;
-		}
 	}
 	
-	public Task SendDefaultMailAsync(string receiverMail, string? receiverName, string subject, string title, string bodyHtml) {
+	public async Task SendDefaultMailAsync(string receiverMail, string? receiverName, string subject, string title, string bodyHtml) {
-		var host = new Uri(string.IsNullOrWhiteSpace(Customizations.AppUrl) ? "" : Customizations.AppUrl); // TODO get link
+		await EmailService.Connect(CancellationToken.None);
-		string logo = !string.IsNullOrWhiteSpace(Customizations.LogoLink)
+		var email = await Email.CreateDefaultEmail(receiverMail, receiverName, subject, title, bodyHtml);
-			? Customizations.LogoLink
+		await EmailService.SendEmailAsync(email);
-			: new Uri(host, "/img/logo.png").AbsoluteUri;
+		await EmailService.Disconnect(CancellationToken.None);
-		string body = TemplateService.Default(host.AbsoluteUri, logo, title, bodyHtml);
-		return SendEmailAsync(receiverMail, receiverName, subject, body);
 	}
 
 	public async Task SendSubscribedMailAsync(EmailSubscriber subscriber, string subject, string title, string bodyHtml, 
 			string browserUrl = "", string subscribedRole = "-1") {
-		(string user, string token) = await TemplateService
+		var email = await Email.CreateSubscribedEmail(subscriber, browserUrl, subject, title, bodyHtml, subscribedRole);
-			.CreateConfirmTokensAsync(subscriber.Id, "unsubscribe-"+subscribedRole, TimeSpan.FromDays(30));
+		await EmailService.Connect(CancellationToken.None);
-		var host = new Uri(string.IsNullOrWhiteSpace(Customizations.AppUrl) ? "" : Customizations.AppUrl); // TODO get link
+		await EmailService.SendEmailAsync(email); // TODO use bulk service
-		browserUrl = string.IsNullOrWhiteSpace(browserUrl) ? host.AbsoluteUri : browserUrl; // TODO find better solution
-		
-		string logo = !string.IsNullOrWhiteSpace(Customizations.LogoLink)
-			? Customizations.LogoLink
-			: new Uri(host, "/img/logo.png").AbsoluteUri;
-		string unsubscribeLink = new Uri(host, 
-			$"/Email/Unsubscribe?newsletter={subscribedRole}&user={WebUtility.UrlEncode(user)}&token={WebUtility.UrlEncode(token)}").AbsoluteUri;
-		string body = TemplateService.Newsletter(host.AbsoluteUri, browserUrl, logo, title, bodyHtml, unsubscribeLink);
-		await SendEmailAsync(subscriber.Email, subscriber.Name, subject, body, 
-			new Header(HeaderId.ListUnsubscribe, $"<{unsubscribeLink}>"),
-			new Header(HeaderId.ListUnsubscribePost, "One-Click"));
 	}
 
 	public async Task SendWelcomeMailAsync(EmailSubscriber subscriber, string subject, string title, string bodyHtml, 
 		IEnumerable<EmailNewsletter> articles) {
-		(string user, string token) = await TemplateService
+		var email = await Email.CreateWelcomeEmail(subscriber, articles, subject, title, bodyHtml);
-			.CreateConfirmTokensAsync(subscriber.Id, "unsubscribe-welcome", TimeSpan.FromDays(30));
+		await EmailService.Connect(CancellationToken.None);
-		var host = new Uri(string.IsNullOrWhiteSpace(Customizations.AppUrl) ? "" : Customizations.AppUrl); // TODO get link
+		await EmailService.SendEmailAsync(email); // TODO use bulk service
+	}
 
-		string articlePartial = (await FileSystemService.GetPartialTemplateAsync("email-article", """
+	public async ValueTask DisposeAsync() {
-			<div style="padding: 10px; background: #9f9f9f; color: #fff; margin-bottom: 10px; border-radius: 2px">
+		await EmailService.DisposeAsync();
-			  <h3 style="margin-top: 0;">{0}</h3>
-			  <small>{1}</small>
-			  <p>{2}...</p>
-			  <a href="{3}">Link</a>
-			</div>
-			"""))!;
-		var articlesHtml = new StringBuilder("");
-		foreach (var n in articles) {
-			string articleLink = ArticleUtilities.GenerateArticleLink(n.Article, new Uri(Customizations.AppUrl, UriKind.Absolute));
-			articlesHtml.AppendFormat(
-				articlePartial, 
-				n.Article.Title, n.Article.Author.Name, n.Article.Body[..Math.Min(250, n.Article.Body.Length)], articleLink);
-		}
-
-		string logo = !string.IsNullOrWhiteSpace(Customizations.LogoLink)
-			? Customizations.LogoLink
-			: new Uri(host, "/img/logo.png").AbsoluteUri;
-		string unsubscribeLink = new Uri(host, 
-			$"/Email/Unsubscribe?newsletter=welcome&user={WebUtility.UrlEncode(user)}&token={WebUtility.UrlEncode(token)}").AbsoluteUri;
-		string body = TemplateService.Welcome(host.AbsoluteUri, logo, title, bodyHtml, unsubscribeLink, articlesHtml.ToString());
-		await SendEmailAsync(subscriber.Email, subscriber.Name, subject, body, 
-			new Header(HeaderId.ListUnsubscribe, $"<{unsubscribeLink}>"),
-			new Header(HeaderId.ListUnsubscribePost, "One-Click"));
 	}
 }
-
-public class EmailNotSendException(string message, Exception exception) : ApplicationException(message, exception);

Wave/Services/StaticEmail.cs

@@ -0,0 +1,8 @@
+using System.Collections.Frozen;
+using Microsoft.Extensions.Hosting;
+using Mjml.Net.Helpers;
+
+namespace Wave.Services;
+
+public record StaticEmail(string ReceiverEmail, string? ReceiverName, string Subject, string Title, string ContentHtml, 
+	FrozenDictionary<string, string> Headers) : IEmail;