Send message as plain E-Mail to a certain address


We use Mattermost very heavily in our company, only a few ppl use E-Mails.
We have got an E-Mail address which is used by our ticket system osTicket. I would like to forward all messages send to the user it-support in Mattermost to without any further text and with the senders E-Mail address as from-address.
Is there a plugin for this or how can I manage this otherwise?