How to use Regex keys as message in the email?

[Amanjain1612]

I figured it out:

<match email**>
  type mail
  host email-smtp.us-east-1.amazonaws.com
  port 587
  from email_id
  to email_id
  subject QA is down
  user **********
  password *************
  enable_starttls_auto true
  enable_tls false
  message DateTime: %s Error message: %s
  message_out_keys datetime,message
</match>