1diff --git a/app/models/global_setting.rb b/app/models/global_setting.rb
2index 6e06e18039..b2bef31fe2 100644
3--- a/app/models/global_setting.rb
4+++ b/app/models/global_setting.rb
5@@ -255,6 +255,7 @@ class GlobalSetting
6 domain: GlobalSetting.smtp_domain,
7 user_name: GlobalSetting.smtp_user_name,
8 password: GlobalSetting.smtp_password,
9+ ca_file: "/etc/ssl/certs/ca-certificates.crt",
10 enable_starttls_auto: GlobalSetting.smtp_enable_start_tls,
11 open_timeout: GlobalSetting.smtp_open_timeout,
12 read_timeout: GlobalSetting.smtp_read_timeout,