[otrs] trouble with Follow up

This is what I get when I send a reply message bask to the system.

DQpUaGFuayB5b3UgZm9yIEUtbWFpbGluZyBzdXBwb3J0QHZpcGRpcmVjdC5uZXQuDQpUaGlzIGlz

in the Logs I get Use_of_uninitialized_vlaue_in_concatenation_(.)_or_string_at_/opt/OpenTRS/bin/..//Kernel/System/PostMaster/FlowwUp.pm_line_206 Any idea what the problem is? thanks Gene Parks VIP Direct