diff --git a/CHANGES.md b/CHANGES.md
index b1494c7..ed82a82 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -2,8 +2,10 @@
 
 ## In Development
 
+- Fix: Controllo validità campi Email e PEC ([#405][405])
 - Fix: CI workflow file rilasciato col package nuget ([#404][404])
 
+[405]: https://github.com/FatturaElettronica/FatturaElettronica.NET/issues/405
 [404]: https://github.com/FatturaElettronica/FatturaElettronica.NET/issues/404
 
 ## Stable
diff --git a/Test/Ordinaria/DatiTrasmissioneValidator.cs b/Test/Ordinaria/DatiTrasmissioneValidator.cs
index ae82fdb..55289ff 100644
--- a/Test/Ordinaria/DatiTrasmissioneValidator.cs
+++ b/Test/Ordinaria/DatiTrasmissioneValidator.cs
@@ -97,10 +97,21 @@ public void CodiceDestinatarioWhenFormatoTrasmissioneHasValueFPR12()
         }
 
         [TestMethod]
-        public void PECDestinatarioMinMaxLength()
+        public void PECDestinatarioIsOptional()
         {
-            Challenge.CodiceDestinatario = new('0', 7);
-            AssertMinMaxLength(x => x.PECDestinatario, 7, 256);
+            AssertOptional(x => x.PECDestinatario);
+        }
+
+        [TestMethod]
+        public void PECDestinatarioMustBeValid()
+        {
+            Challenge.PECDestinatario = "not really";
+            var result = Validator.TestValidate(Challenge);
+            result.ShouldHaveValidationErrorFor(x => x.PECDestinatario);
+            
+            Challenge.PECDestinatario = "maybe@we.can";
+            result = Validator.TestValidate(Challenge);
+            result.ShouldNotHaveValidationErrorFor(x => x.PECDestinatario);
         }
     }
 }
\ No newline at end of file
diff --git a/Test/Semplificata/DatiTrasmissioneValidator.cs b/Test/Semplificata/DatiTrasmissioneValidator.cs
index 12c55ea..3a62c3b 100644
--- a/Test/Semplificata/DatiTrasmissioneValidator.cs
+++ b/Test/Semplificata/DatiTrasmissioneValidator.cs
@@ -81,10 +81,21 @@ public void CodiceDestinatarioWhenFormatoTrasmissioneHasValueFSM10()
         }
 
         [TestMethod]
-        public void PECDestinatarioMinMaxLength()
+        public void PECDestinatarioIsOptional()
         {
-            Challenge.CodiceDestinatario = new('0', 7);
-            AssertMinMaxLength(x => x.PECDestinatario, 7, 256);
+            AssertOptional(x => x.PECDestinatario);
+        }
+
+        [TestMethod]
+        public void PECDestinatarioMustBeValid()
+        {
+            Challenge.PECDestinatario = "not really";
+            var result = Validator.TestValidate(Challenge);
+            result.ShouldHaveValidationErrorFor(x => x.PECDestinatario);
+            
+            Challenge.PECDestinatario = "maybe@we.can";
+            result = Validator.TestValidate(Challenge);
+            result.ShouldNotHaveValidationErrorFor(x => x.PECDestinatario);
         }
     }
 }
\ No newline at end of file
diff --git a/Validators/Constants.cs b/Validators/Constants.cs
new file mode 100644
index 0000000..d5eb185
--- /dev/null
+++ b/Validators/Constants.cs
@@ -0,0 +1,8 @@
+namespace FatturaElettronica.Validators;
+
+public class Constants
+{
+    // Vedi 'EmailType' in https://www.agenziaentrate.gov.it/portale/documents/20143/4631413/Schema_VFPR12.xsd
+    public static string EmailRegex = "([!#-'*+/-9=?A-Z^-~-]+(\\.[!#-'*+/-9=?A-Z^-~-]+)*|"(\\[\\]!#-[^-~ \t]|(\\[\t -~]))+")@([!#-'*+/-9=?A-Z^-~-]+(\\.[!#-'*+/-9=?A-Z^-~-]+)*|\\[[\t -Z^-~]*\\])";
+
+}
diff --git a/Validators/ContattiTrasmittenteValidator.cs b/Validators/ContattiTrasmittenteValidator.cs
index 97e9277..fd0fd59 100644
--- a/Validators/ContattiTrasmittenteValidator.cs
+++ b/Validators/ContattiTrasmittenteValidator.cs
@@ -11,7 +11,8 @@ public ContattiTrasmittenteValidator()
                 .Length(5, 12)
                 .When(x => !string.IsNullOrEmpty(x.Telefono));
             RuleFor(dt => dt.Email)
-                .EmailAddress()
+                .Length(7, 256)
+                .Matches(Constants.EmailRegex)
                 .When(x => !string.IsNullOrEmpty(x.Email));
         }
     }
diff --git a/Validators/ContattiValidator.cs b/Validators/ContattiValidator.cs
index aded89e..221c70b 100644
--- a/Validators/ContattiValidator.cs
+++ b/Validators/ContattiValidator.cs
@@ -14,7 +14,8 @@ public ContattiValidator()
                 .Length(5, 12)
                 .When(x => !string.IsNullOrEmpty(x.Fax));
             RuleFor(x => x.Email)
-                .EmailAddress()
+                .Length(7, 256)
+                .Matches(Constants.EmailRegex)
                 .When(x => !string.IsNullOrEmpty(x.Email));
         }
     }
diff --git a/Validators/DatiTrasmissioneValidator.cs b/Validators/DatiTrasmissioneValidator.cs
index 65ccdbb..7f5a421 100644
--- a/Validators/DatiTrasmissioneValidator.cs
+++ b/Validators/DatiTrasmissioneValidator.cs
@@ -36,6 +36,7 @@ public DatiTrasmissioneValidator()
                 .When(x => x.ContattiTrasmittente != null && !x.ContattiTrasmittente.IsEmpty());
             RuleFor(dt => dt.PECDestinatario)
                 .Length(7, 256)
+                .Matches(Constants.EmailRegex)
                 .When(x => !string.IsNullOrEmpty(x.PECDestinatario));
         }
     }
diff --git a/Validators/Semplificata/DatiTrasmissioneValidator.cs b/Validators/Semplificata/DatiTrasmissioneValidator.cs
index d27f1fa..ac54cb9 100644
--- a/Validators/Semplificata/DatiTrasmissioneValidator.cs
+++ b/Validators/Semplificata/DatiTrasmissioneValidator.cs
@@ -28,7 +28,7 @@ public DatiTrasmissioneValidator()
                 .When(dt => dt.FormatoTrasmissione == Defaults.FormatoTrasmissione.Semplificata)
                 .WithErrorCode("00311");
             RuleFor(dt => dt.PECDestinatario)
-                .Length(7, 256)
+                .Matches(Constants.EmailRegex)
                 .When(x => !string.IsNullOrEmpty(x.PECDestinatario));
         }
     }