If I want to demonstrate sending an email through SMTP and downloading a file through FTP in a github repo, that would ‘just work’ in case someone clones it, without needing to reconfigure, which test services should I use? Is there open endpoints for SMTP that for example just accept and drop the email.

Should I instead host the services inside the repo by finding nuget packages for server components so that the user can clone it and test locally? By making for example a set of small command line services that self host the SMTP and FTP servers?

What would you prefer if you were cloning a github repo?