diff --git a/misp_modules/modules/expansion/otx.py b/misp_modules/modules/expansion/otx.py
index ad9da2f..214e7f0 100755
--- a/misp_modules/modules/expansion/otx.py
+++ b/misp_modules/modules/expansion/otx.py
@@ -45,7 +45,7 @@ def findAll(data, keys):
     return a
 
 def valid_email(email):
-    return bool(re.search(r"^[\w\.\+\-]+\@[\w]+\.[a-z]{2,3}$", email))
+    return bool(re.search(r"[a-zA-Z0-9!#$%&'*+\/=?^_`{|}~-]+(?:\.[a-zA-Z0-9!#$%&'*+\/=?^_`{|}~-]+)*@(?:[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?\.)+[a-zA-Z0-9](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?", email))
 
 def handler(q=False):
     if q is False: