Fatal error: Cannot redeclare hex2bin() in /var/www/localhost/htdocs/postfixadmin-amavis/functions.inc.php on line 1257
This is fixed in SVN trunk and the 2.3 branch since about 2 years.
The postfixadmin-amavis branch is unmaintained (as you can see in its CHANGELOG.TXT which ends at 2.3 beta) - please don't use it anymore! (The few amavis-related changes it has are not available in the user interface anyway.)
You can choose between
- 2.3.x, the stable (and still maintained) version
- SVN trunk, the new version with lots of improvements that will become 3.0