/etc/citadel/messages/entopt is in citadel-server 8.24-1+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 | One of:
message using <A>scii
<B>io
<C>onfiguration
message with <E>ditor
<F>loor
re<G>istration
<M>essage
<P>assword
<R>oom
<T>extfile
file using <X>modem
file using <Y>modem
file using <Z>modem
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