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There is an option, i have seen in Fortimail, that makes you able to filter/drop all newsletter emails. I don't understand how Fortimail detects these type of emails. And I am keen to know whether someone has any solution for this on Postfix mail server.

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This is not something that will be part of the Postfix system itself, although it is almost certain there are plugins that will help.

A commonly used plugin is spamassassin, which parses email and provides a score based on various criteria. There is nothing to stop you adding a plugin to drop newsletter emails. The effectiveness of spamassassin in this instance really depends on a lot of variables, including the number of users, the rules you make/use and what you consider a newsletter. (It could be as simple as tagging anything with "unsubscribe" in the body of the email, but that may be to general or not general enough. Spamassassin gives you A LOT of control, but is non-trivial to use).

One advantage fortinet appears to have is the ability to do heuristics across a wide population of email across many servers which you may not be able to do yourself. In other words, you may be able to craft a 95% solution while fortinet may be able to get a 99.5% solution (figures plucked out of thin air)

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