[otrs] Solving the Outlook Express subject replacement problem

Hi, Is it possible (I ask before digging too far in the configuration file) to replace the colon that precedes the ticket number with a hyphen? For example, instead of: [ID#: 20020505000001] Have OTRS use: [ID#-20020505000001] It seems that regardless of the length of a ticket identifier, Outlook express will replace the text in the subject line preceding the first colon, in our case "[ID#:" is replaced with "Re:" I will continue to explore defaults.pm and see if there's something I'm missing, but I don't recall seeing that configuration option. Thanks, Paul