config: cannot create user preferences file /nonexistent/.spamassassin/user_prefs: No such file or directory

Modifier /etc/default/spamassassin. Remplacer:

OPTIONS="--create-prefs --max-children 5 --helper-home-dir"

par

OPTIONS="--create-prefs --max-children 5 --helper-home-dir -u debian-spamd"

Créer le dossier et ajuster ses permissions:

mkdir -p /nonexistent/.spamassassin
chown debian-spamd: /nonexistent/.spamassassin

et redémarrer le service:

service spamassassin restart