MailUtils wird noch von DakotaSender verwendet

Shared/Extensions/DictionaryExtensions.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace BS.Shared.Extensions
+{
+	public static class DictionaryExtensions
+	{
+		public static T2 GetValueOrDefault<T1, T2>(this Dictionary<T1, T2> dictionary, T1 key, T2 t_default)
+		{
+			if (dictionary is null || !dictionary.Any())
+				return t_default;
+
+			if (dictionary.TryGetValue(key, out var val))
+			{
+				return val;
+			}
+
+			return t_default;
+		}
+	}
+}