diff --git a/backend/core/src/Core.Infrastructure/Compliance/SendGridMailService/SendGridMailService.cs b/backend/core/src/Core.Infrastructure/Compliance/SendGridMailService/SendGridMailService.cs
index 0dc832a..8a17f34 100644
--- a/backend/core/src/Core.Infrastructure/Compliance/SendGridMailService/SendGridMailService.cs
+++ b/backend/core/src/Core.Infrastructure/Compliance/SendGridMailService/SendGridMailService.cs
@@ -35,7 +35,7 @@ public async Task SendMailAsync(Mail mail, Customer customer, Transaction transa
             }
 
             var from = new EmailAddress(_mailOptions.Sender);
-            var to = new EmailAddress(mail.Recipient?.Email) ?? throw new CustomErrorsException("MailService", "toAddress", "An error occured while sending mail.");
+            var to = new EmailAddress(mail.Recipient?.Email?.ToLower().Trim()) ?? throw new CustomErrorsException("MailService", "toAddress", "An error occured while sending mail.");
 
             var msg = new SendGridMessage();
 
@@ -83,7 +83,7 @@ public async Task SendMailAsync(Mail mail, Customer customer, Transaction transa
         public async Task SendOTPCodeMailAsync(Customer customer, string otpCode)
         {
             var from = new EmailAddress(_mailOptions.Sender);
-            var to = new EmailAddress(customer.Email);
+            var to = new EmailAddress(customer.Email?.ToLower().Trim());
             var msg = new SendGridMessage();
 
             msg.SetFrom(new EmailAddress(from.Email, from.Name));
diff --git a/backend/core/src/Core.Infrastructure/Nexus/Repositories/NexusCustomerRepository.cs b/backend/core/src/Core.Infrastructure/Nexus/Repositories/NexusCustomerRepository.cs
index 4c37f43..a334ee0 100644
--- a/backend/core/src/Core.Infrastructure/Nexus/Repositories/NexusCustomerRepository.cs
+++ b/backend/core/src/Core.Infrastructure/Nexus/Repositories/NexusCustomerRepository.cs
@@ -33,7 +33,7 @@ public async Task CreateAsync(Customer customer, string? ip = null, Cancellation
 
             var query = new Dictionary<string, string>
             {
-                { "Email", customer.Email.TrimEnd() }
+                { "Email", customer.Email.ToLower().Trim() }
             };
 
             var existingCustomersWithEmail = await _tokenServer.Customers.Get(query);
@@ -60,7 +60,7 @@ public async Task CreateAsync(Customer customer, string? ip = null, Cancellation
                         BankAccountNumber = null
                     }
                 ])
-                .SetEmail(customer.Email)
+                .SetEmail(customer.Email.ToLower().Trim())
                 .SetStatus(status)
                 .SetCustomData(customer.Data);
 
@@ -84,7 +84,7 @@ public async Task UpdateAsync(Customer customer, CancellationToken cancellationT
             }
 
             var builder = new UpdateCustomerRequestBuilder(customer.CustomerCode)
-                .SetEmail(customer.Email)
+                .SetEmail(customer.Email.ToLower().Trim())
                 .SetStatus(status)
                 .SetCustomData(customer.Data);