ok i’m sorry this is happening to you. yml files are sensitive. i use Hetzner myself. i used to use Digitalocean but the configurations aren’t super different. i prefer the Hetzner dashboard and interface, and they are way cheaper.
i use Hetzner and Resend for email for 3 forum - a busy pubic one, and 2 private forums. when i first migrated to Resend from Mailgun, all the users had to re-login with their existing credentials. of course most just used the email link or reset. this maxed out my Resend quota before the day was out so i had to do some management there and adjust a few settings. but after 2 or 3 days it was back to normal.