"Royal Mail Supports Mental Health" stamped on envelope

[PandyGibberish]

I received yesterday a random item of post with this phrase stamped in big letters on the envelope. I was a bit surprised .

Does anybody know what this means?

[MadForlt]

This will help you

www.rethink.org/news-views/2017/6/mental-health-uk-partners-with-royal-mail