That's even worse than an employer asking an employee to log into his/her Facebook account. I keep all sorts of private information in my personal email... I've got nothing to hide but I'll think twice before flying again to a foreign country.
Edit: Typo
You might be warned by these previous HN topics on life in Saudi Arabia: "In Saudi Arabia Today, A Lady Went for a Drive", "Why western governments won’t support democracy in Saudi Arabia", "Saudi Arabian judge asks hospitals to paralyze man", "Female Producers in Saudi Arabia: "Did you have to wear the black thing?"
Plus as well the more tech-related warnings: "The Great Firewall of Saudi Arabia - Smart & Dynamic Content Filtering", "It's Official: Saudi Arabia Bans Blackberries", "Saudi Arabia blocks Facebook", and "Saudi Arabia bans blogging without a license."
Something like a fifth of Israeli citizens are Arabs, and Arabic is one of Israel's two official languages.