How to solve this situation
[ * ] Configuring Dovecot POP/IMAP mail server…
[ * ] Configuring SpamAssassin…
[ * ] Configuring fail2ban access monitor…
[ * ] Installing Roundcube…
[ * ] Configuring File Manager…
[ * ] Configuring PHP dependencies…
[ * ] Installing Rclone…
[ * ] Configuring System IP…
Error: invalid domain format :: ex. hostname.domain.tld.example.com
Error: can’t create ex. hostname.domain.tld.example.com domain
root@debian:~#