Trying to filter out phishing emails is tough work, even for organizations trying to find a better way through automation, according to a new study from security software company GreatHorn.

The company makes software that seeks out phishing attempts and can autonomously block them, but even its customers don’t switch on all the features, according to GreatHorn’s study of how customers dealt with just over half a million spear phishing attempts.

The most common autonomous action, taken a third of the time against suspicious emails, was to alert an admin when a policy was violated and let them decide what to do. This option is also chosen in order to create a record of potential threats, the company says. Another 6% of emails trigger alerts to the recipients so they can be on the lookout for similar attempts.

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