This script will be run prior to sending the email to allow
modifying the email before sending. The MimeMessage variable
is msg, the build is available as build, a logger
is available as logger. The trigger that caused the email
is available as trigger and all triggered builds are available
as a map triggered.
You may also cancel sending the email by setting the boolean
variable cancel to true.
You can set the default pre-send script here and then use
${DEFAULT_PRESEND_SCRIPT} in the project settings to use
the script written here.