diff --git a/config/environments/production.rb b/config/environments/production.rb
index b47d2ed8..771a6c69 100644
--- a/config/environments/production.rb
+++ b/config/environments/production.rb
@@ -101,6 +101,10 @@ Rails.application.configure do
     }
   end
 
+  # If configured to 'none' don't check the smtp servers certificate
+  ActionMailer::Base.smtp_settings[:openssl_verify_mode] =
+    ENV['SMTP_OPENSSL_VERIFY_MODE'] if ENV['SMTP_OPENSSL_VERIFY_MODE'].present?
+
   # Don't care if the mailer can't send.
   config.action_mailer.raise_delivery_errors = true
 
diff --git a/sample.env b/sample.env
index bf4f7249..129f8d80 100644
--- a/sample.env
+++ b/sample.env
@@ -121,6 +121,9 @@ GOOGLE_ANALYTICS_TRACKING_ID=
 #   SMTP_AUTH=plain
 #   SMTP_STARTTLS_AUTO=true
 #
+# Comment this out to disable SMTP certificate verification. This option may pose a security risk.
+#   SMTP_OPENSSL_VERIFY_MODE=none
+#
 SMTP_SERVER=
 SMTP_PORT=
 SMTP_DOMAIN=