How to stop spam?

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Good afternoon. There Exchnge2013 and ORF5 which is set to a number of different filters. And always if I slipped a few letters, it is extremely rare.
But in the last couple of months almost all daily users began to come spam the same species
5c522540bf557432243690.png
The spam always comes from different IP domains and addresses, so I don't know how to block it.
Maybe someone already faced with this?
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Well, I did the following (same link, but Exch2016) is subject the same? add a keyword blacklist + there is a regular competition of the body. A distinctive feature of that tree of spam email that I recently come has become, it is 98% identical subject + the same signature in the message body - it all overlaps in a keyword blacklist. Well, the domains don't forget to add in the black list. At times, fewer.
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Similarly, faced with the same problem
as razor put Postfix in front of Excel, spam became less significantly less

I used to cut off the attachments ( everyone always name was *zakaz*) but then the pests have become smarter, and the text is sent the download link
Our Buhi gullible, though warned several times not to climb where do not ask.
The specifics of obligation to keep open all sorts of hugedrive, mail disks, dropbox and so on.

I helped the Postfix previously fought with Excel settings, are now fighting with Postfix :)
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