Yunohost/Lemmy

Hi everybody I'm trying to get my lemmy instance working. I've got it installed now using yunohost. But now i'm running into issues with smtp. So first of all when I want to change the smtp setting in the admin of lemmy i get an error "site couldnt get updated" So i changed it in the lemmy.hjson file, but no change is visible in the admin settings in lemmy. Still 127.0.0.1 -no login - no password I assume that is the default setting. When I swaks my relay - brevo it works. So my mailserver setting are correct (I assume) I tried 'sign up' to make an account on my instance but that gives me an "email_send_failed"

Any help would be great! I've searched lemmy forums, yunohost forum and duckduckgo but nothing that helps me. #desperate Thanks!