diff --git a/src/mail/mail_confirmation.py b/src/mail/mail_confirmation.py
index 6e32b28..c3ee5e0 100755
--- a/src/mail/mail_confirmation.py
+++ b/src/mail/mail_confirmation.py
@@ -215,7 +215,7 @@ def find_confirmation_contacts_mail_list(mail_list, subjects: list = None):
     gmx_proxy_config = get_gmx_proxy_config()
     yahoo_proxy_config = get_yahoo_proxy_config()
     # read all the emails
-    with ThreadPoolExecutor(max_workers=200) as executor:
+    with ThreadPoolExecutor(max_workers=100) as executor:
         for mail in mail_list:
             if is_gmx_address(mail.mail) and gmx_proxy_config is not None:
                 executor.submit(read_gmx_proxy_confirmation_emails, mail, mails_messages, gmx_proxy_config, subjects)