Make the newsletter BCC the users rather than creating a million newsletters (Hopefully will stop SMTP providers from marking as spam). This does mean that the custom user customization in the newsletter will no longer work

src/Ombi.Notifications/GenericEmailProvider.cs

@@ -97,8 +97,6 @@ namespace Ombi.Notifications
 
         public async Task Send(NotificationMessage model, EmailNotificationSettings settings)
         {
-            try
-            {
                 EnsureArg.IsNotNullOrEmpty(settings.SenderAddress);
                 EnsureArg.IsNotNullOrEmpty(model.To);
                 EnsureArg.IsNotNullOrEmpty(model.Message);
@@ -120,9 +118,18 @@ namespace Ombi.Notifications
                     Subject = model.Subject
                 };
 
-                message.From.Add(new MailboxAddress(string.IsNullOrEmpty(settings.SenderName) ? settings.SenderAddress : settings.SenderName, settings.SenderAddress));
                 message.To.Add(new MailboxAddress(model.To, model.To));
 
+                await Send(message, settings);
+
+        }
+
+        public async Task Send(MimeMessage message, EmailNotificationSettings settings)
+        {
+            try
+            {
+                message.From.Add(new MailboxAddress(string.IsNullOrEmpty(settings.SenderName) ? settings.SenderAddress : settings.SenderName, settings.SenderAddress));
+
                 using (var client = new SmtpClient())
                 {
                     if (settings.DisableCertificateChecking)

src/Ombi.Notifications/IEmailProvider.cs

@@ -1,4 +1,5 @@
 using System.Threading.Tasks;
+using MimeKit;
 using Ombi.Notifications.Models;
 using Ombi.Settings.Settings.Models.Notifications;
 
@@ -8,5 +9,6 @@ namespace Ombi.Notifications
     {
         Task Send(NotificationMessage model, EmailNotificationSettings settings);
         Task SendAdHoc(NotificationMessage model, EmailNotificationSettings settings);
+        Task Send(MimeMessage message, EmailNotificationSettings settings);
     }
 }

src/Ombi.Notifications/NotificationMessageCurlys.cs

@@ -105,13 +105,10 @@ namespace Ombi.Notifications
             AdditionalInformation = opts?.AdditionalInformation ?? string.Empty;
         }
 
-        public void SetupNewsletter(CustomizationSettings s, OmbiUser username)
+        public void SetupNewsletter(CustomizationSettings s)
         {
             ApplicationUrl = (s?.ApplicationUrl.HasValue() ?? false) ? s.ApplicationUrl : string.Empty;
             ApplicationName = string.IsNullOrEmpty(s?.ApplicationName) ? "Ombi" : s?.ApplicationName;
-            RequestedUser = username.UserName;
-            UserName = username.UserName;
-            Alias = username.Alias.HasValue() ? username.Alias : username.UserName;
         }
 
         public void Setup(NotificationOptions opts, ChildRequests req, CustomizationSettings s, UserNotificationPreferences pref)

src/Ombi.Schedule/Jobs/Ombi/NewsletterJob.cs

@@ -9,6 +9,7 @@ using MailKit;
 using Microsoft.AspNetCore.Identity;
 using Microsoft.EntityFrameworkCore;
 using Microsoft.Extensions.Logging;
+using MimeKit;
 using Ombi.Api.Lidarr;
 using Ombi.Api.Lidarr.Models;
 using Ombi.Api.TheMovieDb;
@@ -24,6 +25,7 @@ using Ombi.Settings.Settings.Models.External;
 using Ombi.Settings.Settings.Models.Notifications;
 using Ombi.Store.Entities;
 using Ombi.Store.Repository;
+using ContentType = Ombi.Store.Entities.ContentType;
 
 namespace Ombi.Schedule.Jobs.Ombi
 {
@@ -162,7 +164,23 @@ namespace Ombi.Schedule.Jobs.Ombi
                             Email = emails
                         });
                     }
-                    var emailTasks = new List<Task>();
+
+                    var messageContent = ParseTemplate(template, customization);
+                    var email = new NewsletterTemplate();
+
+                    var html = email.LoadTemplate(messageContent.Subject, messageContent.Message, body, customization.Logo);
+
+                    var bodyBuilder = new BodyBuilder
+                    {
+                        HtmlBody = html,
+                    };
+
+                    var message = new MimeMessage
+                    {
+                        Body = bodyBuilder.ToMessageBody(),
+                        Subject = messageContent.Subject
+                    };
+                    
                     foreach (var user in users)
                     {
                         // Get the users to send it to
@@ -170,17 +188,13 @@ namespace Ombi.Schedule.Jobs.Ombi
                         {
                             continue;
                         }
-
-                        var messageContent = ParseTemplate(template, customization, user);
-                        var email = new NewsletterTemplate();
-
-                        var html = email.LoadTemplate(messageContent.Subject, messageContent.Message, body, customization.Logo);
-
-                        emailTasks.Add(_email.Send(
-                            new NotificationMessage { Message = html, Subject = messageContent.Subject, To = user.Email },
-                            emailSettings));
+                        // BCC the messages
+                        message.Bcc.Add(new MailboxAddress(user.Email, user.Email));
                     }
 
+                    // Send the email
+                    await _email.Send(message, emailSettings);
+
                     // Now add all of this to the Recently Added log
                     var recentlyAddedLog = new HashSet<RecentlyAddedLog>();
                     foreach (var p in plexContentMoviesToSend)
@@ -234,7 +248,6 @@ namespace Ombi.Schedule.Jobs.Ombi
                         });
                     }
                     await _recentlyAddedLog.AddRange(recentlyAddedLog);
-                    await Task.WhenAll(emailTasks.ToArray());
                 }
                 else
                 {
@@ -245,7 +258,7 @@ namespace Ombi.Schedule.Jobs.Ombi
                         {
                             continue;
                         }
-                        var messageContent = ParseTemplate(template, customization, a);
+                        var messageContent = ParseTemplate(template, customization);
 
                         var email = new NewsletterTemplate();
 
@@ -305,12 +318,12 @@ namespace Ombi.Schedule.Jobs.Ombi
             return itemsToReturn;
         }
 
-        private NotificationMessageContent ParseTemplate(NotificationTemplates template, CustomizationSettings settings, OmbiUser username)
+        private NotificationMessageContent ParseTemplate(NotificationTemplates template, CustomizationSettings settings)
         {
             var resolver = new NotificationMessageResolver();
             var curlys = new NotificationMessageCurlys();
 
-            curlys.SetupNewsletter(settings, username);
+            curlys.SetupNewsletter(settings);
 
             return resolver.ParseMessage(template, curlys);
         }