The next generation of spam and phishing e-mails could fool both software filters and the most cautious people, Canadian researchers said Sunday, by mimicking the way friends and real companies write messages.

John Aycock, an assistant professor of computer science at the University of Calgary, and his student, Nathan Friess, presented a paper Sunday at a conference in Hamburg, Germany that outlined how junk mailers and phishers, even criminals, could create slicker spam.

Read more: Smarter Spam Could Mimic Friends’ Mail