diff --git a/EnvelopeGenerator.Application/Services/ReceiverService.cs b/EnvelopeGenerator.Application/Services/ReceiverService.cs
index f58727e4..5c9d19a7 100644
--- a/EnvelopeGenerator.Application/Services/ReceiverService.cs
+++ b/EnvelopeGenerator.Application/Services/ReceiverService.cs
@@ -6,7 +6,6 @@ using EnvelopeGenerator.Application.DTOs;
 using EnvelopeGenerator.Domain.Entities;
 using EnvelopeGenerator.Infrastructure.Contracts;
 using EnvelopeGenerator.Application.Resources;
-using Microsoft.AspNetCore.Mvc;
 
 namespace EnvelopeGenerator.Application.Services
 {
diff --git a/EnvelopeGenerator.Domain/Entities/Receiver.cs b/EnvelopeGenerator.Domain/Entities/Receiver.cs
index 193ba895..9e960b64 100644
--- a/EnvelopeGenerator.Domain/Entities/Receiver.cs
+++ b/EnvelopeGenerator.Domain/Entities/Receiver.cs
@@ -13,11 +13,11 @@ namespace EnvelopeGenerator.Domain.Entities
 
         [Required]
         [Column("EMAIL_ADDRESS", TypeName = "nvarchar(128)")]
-        public string EmailAddress { get; set; }
+        public required string EmailAddress { get; set; }
 
         [Required]
         [Column("SIGNATURE", TypeName = "nvarchar(64)")]
-        public string Signature { get; set; }
+        public required string Signature { get; set; }
 
         [Required]
         [Column("ADDED_WHEN", TypeName = "datetime")]