(snappymail )Mailserver too busy. Please try again later

Hello.
Ubuntu 20.04.5 LTS (GNU/Linux 5.15.0-56-generic x86_64)
Current Version: 2.3 lasted Latest Commit Latest

I am trying to access the webmail but I have this error
Mailserver too busy. Please try again later.
https://domain.tld/snappymail/index.php however if I enter https://domain.tld/rainloop/index.php
it works perfectly