Thank you for answer Till!
I reinstall ISPConfig and re-replicate mysql.
But question about mirroring, if I something create on slave server for expl. new mailbox. On should to be on master server too or mirroring goes only one direction?
I am asking because I create one email on slave and now did not see it on master. If it is normal it is ok.
But it is possible to create bi-direction mirroring?