We're currently using JETI as a mail handler in replace of JIRA and experience issues with JETI where when a new ticket is created from email and the same email is forwarded to another JIRA project, it ends up as a comment to the original ticket.
We verified that the other JIRA project is configured properly by testing it separately. We also tested the case where we copy and pasted the same "Subject" and "Body" and sent to the same alias and it worked properly. It just seems to only be the case where we forward the original email to another alias that this happens. We checked that the message ID was different so any help in this would be useful.
We're currently running Email This Issue plugin 5.3.3.6 and JIRA 5.1.5.