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With Postfix you can define mine header checks, to block certain email attachments

like *.exe or *.bat etc. You can enable this bij doing the following:
Open main.cf file:

 

Append the mime_header_checks directive as follow on the bottom of the file:

Save and close the file with crtl+x and choose yes
Then create the postfix lookup table for mime_header_checks file:

Now open the /etc/postfix/mime_header_checks file:

Add following line to block the file extensions:

Save and close the file. (control+x and choose yes)
Restart postfix:

You should see rejected mail log in /var/log/maillog file by entering the following:

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