add SMTP_SSL_VERIFY env

config/environments/production.rb

@@ -85,6 +85,7 @@ Rails.application.configure do
       domain: ENV.fetch('SMTP_DOMAIN', nil),
       user_name: ENV.fetch('SMTP_USERNAME', nil),
       password: ENV.fetch('SMTP_PASSWORD', nil),
+      openssl_verify_mode: ENV['SMTP_SSL_VERIFY'] == 'false' ? OpenSSL::SSL::VERIFY_NONE : OpenSSL::SSL::VERIFY_PEER,
       authentication: ENV.fetch('SMTP_PASSWORD', nil).present? ? ENV.fetch('SMTP_AUTHENTICATION', 'plain') : nil,
       enable_starttls: ENV['SMTP_ENABLE_STARTTLS'] != 'false'
     }.compact