start new email with with Button click

Hi Everyone, my problem is the following:
I have a list of email addresses, and also I have a measure where all email addresses are concatenated as text like: "mailto:email1; email2; email3; ..." 
My task would be to start a new mail (using default email tool) with click of a Button on the report. Is it possible with button somehow?

Setting it as Web Url somehow did not work. Or how to set the string that it could work for me?