An error was encountered whilst handling messages from the mail server"StartPortal" using the handler "class com.atlassian.jira.plugins.mail.handlers.CreateOrCommentHandler".The error was:------------------------"Unable to create issue with message."
Got the same error. My problem was in workflow first "Create" transition, there was a mistake there that prevented issue creation also via Jira. After fixing workflow also the e-mail creation started working.
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