The correct options are The mail processor was deleted, The mailbox location was modified and it is now empty, and The default reporter lost the Create Issues project permission.

The mail processor was deleted is correct because removing the processor stops the service that converts incoming mail into issues. If the handler no longer exists it will not poll or accept messages and that explains why mail that once created issues now does nothing.

The mailbox location was modified and it is now empty is correct because the processor has nothing to read when the mailbox folder or path is changed or when messages are moved. An empty or wrong mailbox location means no emails are available for conversion into issues even for previously working senders.

The default reporter lost the Create Issues project permission is correct because the mail handler often needs a valid reporter account that can create issues. If the default reporter account no longer has the Create Issues permission the handler may fail to create issues even though emails are being received.

The mailbox credentials expired is unlikely to be the root cause here because expired credentials typically produce visible authentication failures or error logs rather than the wider symptom of previously processed messages simply no longer creating issues when the processor still exists.

An issue type was removed from the mail processor configuration is not the best answer because removing an issue type would affect mappings for certain emails but it would not usually stop the entire processor from creating issues for all messages.

An issue security level is missing from the project is not the primary cause because missing security levels normally affect issue visibility or assignment rather than preventing issue creation across the board. This is less likely than a deleted processor, an empty mailbox, or a permission loss.

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