diff --git a/docs/resources/realm.md b/docs/resources/realm.md
index ec1ed82f5..35d6a9969 100644
--- a/docs/resources/realm.md
+++ b/docs/resources/realm.md
@@ -33,6 +33,7 @@ resource "keycloak_realm" "realm" {
     from = "example@example.com"
 
     auth {
+      auth_type = "basic"
       username = "tom"
       password = "password"
     }
@@ -161,6 +162,7 @@ This block supports the following arguments:
 - `auth` - (Optional) Enables authentication to the SMTP server.  This block supports the following arguments:
     - `username` - (Required) The SMTP server username.
     - `password` - (Required) The SMTP server password.
+    - `auth_type` - (Optional) The authentication type. Only `basic` is supported by the provider which is for password based authentication.
 
 ### Internationalization
 
diff --git a/keycloak/realm.go b/keycloak/realm.go
index aa635187c..3d16eac72 100644
--- a/keycloak/realm.go
+++ b/keycloak/realm.go
@@ -170,6 +170,7 @@ type SmtpServer struct {
 	Ssl                types.KeycloakBoolQuoted `json:"ssl,omitempty"`
 	User               string                   `json:"user,omitempty"`
 	Password           string                   `json:"password,omitempty"`
+	AuthType           string                   `json:"authType,omitempty"`
 }
 
 func (keycloakClient *KeycloakClient) NewRealm(ctx context.Context, realm *Realm) error {
diff --git a/provider/resource_keycloak_realm.go b/provider/resource_keycloak_realm.go
index 240782c61..8b39fe0af 100644
--- a/provider/resource_keycloak_realm.go
+++ b/provider/resource_keycloak_realm.go
@@ -303,6 +303,12 @@ func resourceKeycloakRealm() *schema.Resource {
 											return smtpServerPassword == "**********"
 										},
 									},
+									"auth_type": {
+										Type:         schema.TypeString,
+										Optional:     true,
+										Default:      "basic",
+										ValidateFunc: validation.StringInSlice([]string{"basic"}, false), // Only basic is supported by the provider for now
+									},
 								},
 							},
 						},
@@ -815,6 +821,8 @@ func getRealmFromData(data *schema.ResourceData, keycloakVersion *version.Versio
 			smtpServer.Auth = true
 			smtpServer.User = auth["username"].(string)
 			smtpServer.Password = auth["password"].(string)
+			smtpServer.AuthType = auth["auth_type"].(string)
+
 		} else {
 			smtpServer.Auth = false
 		}
@@ -1245,6 +1253,7 @@ func setRealmData(data *schema.ResourceData, realm *keycloak.Realm, keycloakVers
 
 			auth["username"] = realm.SmtpServer.User
 			auth["password"] = realm.SmtpServer.Password
+			auth["auth_type"] = realm.SmtpServer.AuthType
 
 			smtpSettings["auth"] = []interface{}{auth}
 		}