RT not sending email - No recipients found

I have just setup my new web server and successfully installed RT as per
instructions. Everything seems to work fine, I can email in a ticket and
get an autoreply from RT, however when I attempt to add a comment, or
reply within the ticket no email is sent to the requestor. I have turned
on debugging and found these entries in the rt.log file.

rt-3.4.2-3-104-5.12.837616257616@adastral.ucl.ac.uk #3/104 - Scrip 5
rt-3.4.2-3-104-5.12.837616257616@adastral.ucl.ac.uk No recipients
found. Not sending. (/usr/local/rt/lib/RT/Action/SendEmail.pm:247)

I am fairly unfamiliar with RT, but have read most of the documentation
but can’t find the answer, can anyone help?

RT version 3.4.2

Many thanks,


Neil Marjoram
Systems Manager
Adastral Park Campus
University College London
Ross Building
Adastral Park
Martlesham Heath
Ipswich - Suffolk

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