Hello,

There is one addon developed for that:
http://otrsaddons.com/node/4857

It's for version 3.1 but you could edit the opm file on the line that says 

    <Framework>3.1.x</Framework>
Change it to your OTRS version and try.

If you have OTRS 4, there is a feature for system maintenance: 
http://otrs.github.io/doc/manual/admin/4.0/en/html/administration.html#adminarea-systemmaintenance


On 9 March 2016 at 08:14, André Cavalcante <treba.andre@gmail.com> wrote:
Hi there,

Can I write a message on the CUSTOMER LOGIN page? Please see the attached image.

--
André Luiz C. e Cavalcante


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