Hello, I download em client for evaluation before purchase and seems good except for one issue. There seems to be no “blocking” feature for unwanted e-mails/contacts. I found noting in the help menu. Can this be done? And if so, how?
Thank You in advance.

you can create a custom rule using menu Tools->Rules where you can specify what emails or contacts you want to filter. Unsafe content is configurable in menu Tools->Settings->Read->Unsafe Content.
We plan to improve the blocking system but in more distant future.