/etc/icinga2/scripts/mail-service-notification.sh is in icinga2-common 2.6.0-2+deb9u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 | #!/bin/sh
template=`cat <<TEMPLATE
***** Icinga *****
Notification Type: $NOTIFICATIONTYPE
Service: $SERVICEDESC
Host: $HOSTALIAS
Address: $HOSTADDRESS
State: $SERVICESTATE
Date/Time: $LONGDATETIME
Additional Info: $SERVICEOUTPUT
Comment: [$NOTIFICATIONAUTHORNAME] $NOTIFICATIONCOMMENT
TEMPLATE
`
/usr/bin/printf "%b" "$template" | mail -s "$NOTIFICATIONTYPE - $HOSTDISPLAYNAME - $SERVICEDISPLAYNAME is $SERVICESTATE" $USEREMAIL
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