A perfectly working installation of Horde 3.1.1, IMP 4.1.1 started to show the following error when a user tries to open his mailbox: Fatal error: Call to undefined function: raiseerror() in /usr/share/php/Mail/RFC822.php on line 197 RFC822.php source says its version is 1.7. How can I fix this? -- Milos Prudek