Author of Barebones CMS here. The message you received is associated with your IP address, which indicates that your current IP address has probably been flagged globally a known spam source. Even after you clear up the spam issue on your end, the IP information on the server side is cached for two weeks. You can always send an e-mail to firstname.lastname@example.org.
NodeBB is not associated with MyBB. The folks behind MyBB are not associated with Barebones CMS nor any other CubicleSoft related product.
@GarrettBryan the domain is correctly routed.
The only problem is at login/registration.
And I tried with the domain only too.
I wonder if is not a problem with the server time @PitaJ
Initially I login on localhost, which works correctly.
Then on Heroku could fail because the server is on a different time zone?