Like every year, currently dubious providers try to sell participant lists of VENUS or entries in supposed exhibitor catalogs. There is no VENUS exhibition catalog and our exhibitors can be seen here for free https://www.venus-berlin.com/ausstellerverzeichnis-venus-2019/
Do not help these fools and ignore such emails.
If you are not sure whether a request really comes officially from VENUS or not, please ask us briefly.