I have about 5 users setup in JIRA. Most of us can create an issue by emailing email@example.com however one user cannot. He does not receive any notifications that the email was not sent.
I've verified he is a JIRA user and is not using any special characters when he sends the email.
On the server, you can get the location by going to Admin -> System information
However, I just realised you said "atlassian.net" - does that mean you're using OnDemand? You won't be able to read the logs for that, but you are supported, and Atlassian will be able to read them and help you debug it.
Another thing to check though - does the user have "create issue" permission in the default project for your mail, and does he have "comment" rights anywhere? If he's got comment somewhere you don't mind a bit of noise, ask him to send a new email with a specific Issue Key in the subject - an issue you know he can comment on, that might tell us more.
you can check the ...\Atlassian\JIRA\logs\jira241212102044-stdout.2013-09-10.log kind of file if is a stand alone jira
In my case C:\Program Files\Atlassian\JIRA\logs\jira241212102044-stdout.2013-09-10.log
but you need refresh/load the file for every change you check.
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