Recently we have applied changes to our spam filters. They are about separation of users by their devices: desktops or mobile gadgets.
Visitors more often surf through websites with smartphones and tablets, so it is necessary to separate them, besides spambots became to use mobile device parameters often as well.
The changes made it better to detect mobile devices since their parameters of conduct and parameters of messages differ from desktop browsers. Moreover, human/spambot detection for sent messages from mobile devices was improved too.
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