By default JIRA processes all messages that with DELETED flag set to false. Once they're processed by mail handler they're marked as deleted. Default mail handlers do not take the SEEN flag into account. Possibly some 3rd party mail handler could do that. Alternatively you might want to create custom mail handler that processes only unread messages.
In the past, Portfolio for Jira required a high degree of detail–foresight that was unrealistic for many businesses to have–in order to produce a reliable long-term roadmap. We're tur...
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