No you need to specify SMTP account you have created for which ever mail provider you have selected.
Email is CRITICAL for account creation and notifications in Discourse. If you do not properly configure email before bootstrapping YOU WILL HAVE A BROKEN SITE!
- Already have a mail server? Great. Use your existing mail server credentials.
- No existing mail server? Check out our Recommended Email Providers for Discourse .
- To ensure mail deliverability, you must add valid SPF and DKIM records in your DNS. See your mail provider instructions for specifics.
Source: Cloud install guide