I can reproduce this bug in latest version too: ii php5-recode 5.2.0-8+etch10
For example, following single header line will cause the crash if inbox is opened in squirrelmail: Subject: =?GB2312?B?S29lbm50ZW4gU2llIG1pciBoZWxmZW4gPyhCZXJ3ZXJidW5nc3NjaHJlaWJ1bmcp? = Squirrelmail packages versions are: ii squirrelmail 1.4.13-2 ii squirrelmail-decode 1.2-1 As workaround I added following line to php.ini (squirrelmail does not depend on recode_string): disable_function = recode_string -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]