Reply problem

Hi, I’m having trouble setting up RT3. It receives messages just
fine, but I can’t reply to them. Here is the log entry whenever I try:

Feb 3 16:51:47 rt RT: RT::Scrip=HASH(0x954a3d8): Couldn’t prepare Open Tickets (/usr/share/perl5/RT/Scrip_Overlay.pm:338)
Feb 3 16:51:47 rt RT: rt-3.0.6-4-26.19.907664978269@jtan.com #4/26 - Scrip 4 (/usr/share/perl5/RT/Action/SendEmail.pm:92)
Feb 3 16:51:47 rt RT: rt-3.0.6-4-26.19.907664978269@jtan.com No recipients found. Not sending. (/usr/share/perl5/RT/Action/SendEmail.pm:257)
Feb 3 16:51:47 rt RT: rt-3.0.6-4-26.17.3794794650993@jtan.com #4/26 - Scrip 5 (/usr/share/perl5/RT/Action/SendEmail.pm:92)
Feb 3 16:51:47 rt RT: RT::Scrip=HASH(0x9554030): Couldn’t commit Notify Requestors and Ccs (/usr/share/perl5/RT/Scrip_Overlay.pm:345)
Feb 3 16:51:48 rt RT: rt-3.0.6-4-26.1.02135451518969@jtan.com #4/26 - Scrip 6 (/usr/share/perl5/RT/Action/SendEmail.pm:92)
Feb 3 16:51:48 rt RT: rt-3.0.6-4-26.1.02135451518969@jtan.com No recipients found. Not sending. (/usr/share/perl5/RT/Action/SendEmail.pm:257)

Is replying to a recipient not enabled by default? Any help would be
much appreciated. My perl is version 5.8.2 & I’m running Debian
Sarge.