diff --git a/api/core/tools/provider/builtin/email/tools/send_mail.py b/api/core/tools/provider/builtin/email/tools/send_mail.py
index d51d5439b7..33c040400c 100644
--- a/api/core/tools/provider/builtin/email/tools/send_mail.py
+++ b/api/core/tools/provider/builtin/email/tools/send_mail.py
@@ -17,7 +17,7 @@ class SendMailTool(BuiltinTool):
         invoke tools
         """
         sender = self.runtime.credentials.get("email_account", "")
-        email_rgx = re.compile(r"^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$")
+        email_rgx = re.compile(r"^[a-zA-Z0-9._-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$")
         password = self.runtime.credentials.get("email_password", "")
         smtp_server = self.runtime.credentials.get("smtp_server", "")
         if not smtp_server:
diff --git a/api/core/tools/provider/builtin/email/tools/send_mail_batch.py b/api/core/tools/provider/builtin/email/tools/send_mail_batch.py
index ff7e176990..537dedb27d 100644
--- a/api/core/tools/provider/builtin/email/tools/send_mail_batch.py
+++ b/api/core/tools/provider/builtin/email/tools/send_mail_batch.py
@@ -18,7 +18,7 @@ class SendMailTool(BuiltinTool):
         invoke tools
         """
         sender = self.runtime.credentials.get("email_account", "")
-        email_rgx = re.compile(r"^[a-zA-Z0-9_-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$")
+        email_rgx = re.compile(r"^[a-zA-Z0-9._-]+@[a-zA-Z0-9_-]+(\.[a-zA-Z0-9_-]+)+$")
         password = self.runtime.credentials.get("email_password", "")
         smtp_server = self.runtime.credentials.get("smtp_server", "")
         if not smtp_server: