Check the mailqueue
/opt/zimbra/libexec/zmqstat
Whitelist/blacklist a domain
vim /opt/zimbra/conf/amavisd.conf.in
/cert.org
# Add the domain to this array, a negative score whitelists, a positive score blacklists. Whitelist example:
# 'zimbra.com' => -10.0,
Whitelist IP on DoS filter
zmprov mcf +zimbraHttpThrottleSafeIPs 10.0.0.0/24
The attribute zimbraGalAccountId from domain has an ID reference from an invalid account:
zmprov gd <domain> zimbraGalAccountId
zmprov md <domain> -zimbraGalAccountId "<id>"