Issue opened by email has correct reporter but also results opened by another user

Description

I've a workflow which automatically opens issues by mail and triggers the transiction to put them in a particular status (RICEVUTA MAIL - see attached file).
The problem is that sometimes the issue reports that is opened by the default reporter (DLCI System) AND also that a random user from the user directory (an Active Directory instance) opened it. When such a user is picked, the automatic transiction fails to trigger and the issue remains in the first status (APERTO).
The activity stream of such users is empty (often they are users that have never logged in the system...).
For privacy reasons I cannot attach the entire log.

Environment

None

Preliminary Test Cases

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Assignee

Tibor Hegyi

Reporter

marcom

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Fix versions

Priority

Major
Configure