The 1st response from the attempt to subscribe with my work e-mail seems promising:
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#
John_Dutcher@URMC.Rochester.edu has requested that you be subscribed rebol mailing list.
#
# To subscribe, reply to this message, leaving the message body # intact, or send the following lines in e-mail to # lists@rebol.com:
// job
appsub rebol
John_Dutcher@URMC.Rochester.edu \ 40D09600:3DBA.1:eroby // eoj
---
Ecartis v1.0.0 - job execution complete.
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but after 'replying' as directed, the following always results:


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Request received for list 'rebol' via request address.
>> appsub rebol
John_Dutcher@URMC.Rochester.edu 40D09600:3DBA.1:eroby
>> // eoj
Invalid number of parameters.
>> ---
Unknown command.
>> Ecartis v1.0.0 - job execution complete.
Unknown command.