I tried it and got:
apachectl -t
AH00526: Syntax error on line 7 of /etc/apache2/conf-enabled/sympl-webmail.conf:
Invalid command ‘php_admin_value’, perhaps misspelled or defined by a module not included in the server configuration
Not using the webmail on this box, so I removed it, and all was well. But something isn’t quite as it should be