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Once an issue has been created, the reporter and existing request participants (possibly who existed on to/cc of a creating email) can comment. JSD will deny un-involved customers access to comment on such issues, causing a new issue to be created instead.
Caveats to both scenarios below are the requirement for a Customer account to be related to the sender email address. JEMH can auto-create users, and also, can auto-join them to a nominated group, in pre JEMH 3.0 this was required for JSD related operations to work, in JEMH 3.0.x it is only required in some cases to satisfy JSD permissions checks.
Scenario 1: Allow External Customer Comments
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