esperinas
All data is shared on SME-server. My question: a ransomware malware can it encrypt data on a ibay?
...and another good way to stop incoming viruses etc, is to use executable content blocking on the server, so email attachments that contain nasty code cannot get into your system via emails.
The cost penalty is that users cannot send/receive certain types of attachments, but you can create an upload/download facility on the server using numerous software tools.
Ideally block all zip (v1, v2 & others) because that wil really stop a huge amount of viruses & spam that can still get through otherwise.
....and of course use RBL lists (enable them on sme server).
Read the FAQ & Email Howto for details.