Service Desk: Sending mails to creator and support team in Solman 7.1

Dear SAP experts,

I'm trying to configure a service desk on Solution Manager 7.1. Support team determination is done by BRFplus, this works fine. Now I want to send an email, if the ticket status is changing (or a new ticket is created).

I tried to change ZMIN_STD_MAIL, ZMIN_STD_MAIL_PROCESSOR, ZMIN_STD_MAIL_WATCHLIST and ZMIN_STD_FIND_TEAM_SEND_EMAIL but I couldn't send a single mail with these. I guess the problem might be BUS2000223?

Did anyone experience the same problems?

Thank you for helping,

Michael