According to https://www.hardened-php.net/
Suhosin is an advanced protection system for PHP installations. It was designed to protect your servers on the one hand against a number of well known problems in PHP applications and on the other hand against potential unknown vulnerabilities within these applications or the PHP core itself.
You need to ask your hosting provider to switch your PHP configuration from Basic to Intermediate. This would allow functions like Mail() and Eval() that WordPress requires.
