diff --git a/MatrixSDK/Utils/MXTools.m b/MatrixSDK/Utils/MXTools.m
index e17e7134c..22435cd7d 100644
--- a/MatrixSDK/Utils/MXTools.m
+++ b/MatrixSDK/Utils/MXTools.m
@@ -30,7 +30,7 @@
 #warning File has not been annotated with nullability, see MX_ASSUME_MISSING_NULLABILITY_BEGIN
 
 #pragma mark - Constant definition
-NSString *const kMXToolsRegexStringForEmailAddress              = @"[A-Z0-9._%+-]+@[A-Z0-9.-]+\\.[A-Z]{2,}";
+NSString *const kMXToolsRegexStringForEmailAddress              = @"^[a-zA-Z0-9_!#$%&'*+/=?`{|}~^-]+(?:\\.[a-zA-Z0-9_!#$%&'*+/=?`{|}~^-]+)*@[a-zA-Z0-9-]+(?:\\.[a-zA-Z0-9-]+)*$";
 
 // The HS domain part in Matrix identifiers
 #define MATRIX_HOMESERVER_DOMAIN_REGEX                            @"[A-Z0-9]+((\\.|\\-)[A-Z0-9]+){0,}(:[0-9]{2,5})?"