FORTIMAIL : Antispam for "hi there" messages

[waaalex]

Hello,

Since 1 month, we have a lot of spam on our mailboxes.

Subject are "hi", "hi!", "hi there"... and in content, it tells to text message on US phone number.

Incoming address is changing every time.

How could i block this?

Thank you very much.

Regards,

Alex.