====== Reminder Mail Placeholders (txt/html) ======
An example:
{$customer} stepping stone GmbH
{$system} kvm-0003: stepping stone GmbH: Gentoo (stoney backup Server)
{$salutation} Dear Mr.
{$surname} Eichenberger
{$inform} - Michael Eichenberger <michael.eichenberger@stepping-stone.ch>
{$responsible} - Christian Affolter <christian.affolter@stepping-stone.ch>
{$deputy} - Tiziano Müller <tiziano.müllser@stepping-stone.ch>
{$maintenance_date} 2016-08-17
{$maintenance_start} 16:00
Optional Values:
none
====== A Complete Example ======