To disable spamassassin and clamd in /usr/local/vesta/conf/vesta.conf change from:
ANTIVIRUS_SYSTEM='clamav-daemon' ANTISPAM_SYSTEM='spamassassin'
to:
ANTIVIRUS_SYSTEM='' ANTISPAM_SYSTEM=''
In /etc/exim/exim.conf change from yes to no:
SPAMASSASSIN = no CLAMD = no
Then disable and stop services:
systemctl disable spamassassin systemctl disable clamd systemctl stop spamassassin systemctl stop clamd
Restart vesta service
systemctl restart vesta