BF: forgot to define sender in jail.conf

debian/jail.conf

@@ -66,6 +66,9 @@ destemail = root@localhost
 # Name of the sender for mta actions
 sendername = Fail2Ban
 
+# Email address of the sender
+sender = fail2ban@localhost
+
 #
 # ACTIONS
 #
@@ -533,7 +536,7 @@ enabled  = false
 filter   = sshd
 action   = iptables[name=SSH, port=ssh, protocol=tcp]
            sendmail-whois[name=SSH, dest="%(destemail)s", sender="%(sender)s", sendername="%(sendername)s"]
-           blocklist_de[email="%(sender)s", apikey="xxxxxx", service=%(filter)s]
+           blocklist_de[email="%(sender)s", apikey="xxxxxx", service="%(filter)s"]
 logpath  = /var/log/sshd.log
 maxretry = 20