Hey there. I was able to stand RStudio Connect up on Ubuntu 18.04 on EC2, and successfully Published the histogram app (the default... File>New>ShinyApp) to the server. Huzzah!
I tried to invite some coworkers to the Connect server by creating users, but it said I need to setup email. I get it... there is no ActionMailer equivalent for this framework yet.
So from the Connect web UI setting page, I was able to setup SMTP for MailGun and send a test email successfully (I did this after successfully sending a test email by configuring Sendmail from command line).
However, neither method allowed me to successfully send User Invites. I just get the message:
“Error: Unable to send email. Please contact your RStudio Connect administrator.”
UPDATE: This is a fresh install of R and Connect as of this afternoon. I am a new user (aka the feature never "used to work"). I tried restarting the EC2 machine, restarting the connect service, logging out/in of the web portal, and the good ol' fashion just wait an hour or two for something different to happen.
[RStudio Connect] Test Email RStudio Connect <firstname.lastname@example.org> Tue, Apr 23, 2019 at 4:51 PM To: email@example.com This is a test of RStudio Connect's email sending configuration.