Mail is not correctly finding a user that exists - then User creation fails with DuplicateEntityException

2007-03-08 18:57:12,332 JiraQuartzScheduler_Worker-2 ERROR [service.util.handler.AbstractMessageHandler] Error occurred while automatically creating a new user from email: 
com.opensymphony.user.DuplicateEntityException: The user jira@example.com already exists.
        at com.atlassian.core.user.UserUtils.createUser(UserUtils.java:181)
        at com.atlassian.core.user.UserUtils.createUser(UserUtils.java:171)
        at com.atlassian.jira.util.JiraUserUtils.createJiraUser(JiraUserUtils.java:74)
        at com.atlassian.jira.service.util.handler.AbstractMessageHandler.createUserForReporter(AbstractMessageHandler.java:542)
        at com.atlassian.jira.service.util.handler.AbstractMessageHandler.getReporter(AbstractMessageHandler.java:485)
        at com.atlassian.jira.toolkit.service.handler.CreateSupportIssueHandler.handleMessage(CreateSupportIssueHandler.java:101)
        at com.atlassian.jira.toolkit.service.handler.CreateSupportIssueHandler.handleMessage(CreateSupportIssueHandler.java:80)
        at com.atlassian.jira.service.services.mail.MailFetcherService.run(MailFetcherService.java:190)
        at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:67)
        at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:48)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)
2007-03-08 18:57:12,332 JiraQuartzScheduler_Worker-2 WARN [toolkit.service.handler.CreateSupportIssueHandler] Sender is anonymous, no default reporter specified and creating users is set to false. Message rejected.

2007-03-08 18:57:15,589 JiraQuartzScheduler_Worker-2 ERROR [service.services.mail.MailFetcherService] Throwable: com.atlassian.mail.MailException: com.sun.mail.smtp.SMTPSendFailedException: 552 Error: message too large

com.atlassian.mail.MailException: com.sun.mail.smtp.SMTPSendFailedException: 552 Error: message too large

        at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:183)
        at com.atlassian.jira.service.services.mail.MailFetcherService.sendMail(MailFetcherService.java:353)
        at com.atlassian.jira.service.services.mail.MailFetcherService.forwardEmail(MailFetcherService.java:319)
        at com.atlassian.jira.service.services.mail.MailFetcherService.run(MailFetcherService.java:194)
        at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:67)
        at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:48)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:191)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:516)
Caused by: com.sun.mail.smtp.SMTPSendFailedException: 552 Error: message too large

        at com.sun.mail.smtp.SMTPTransport.issueSendCommand(SMTPTransport.java:1275)
        at com.sun.mail.smtp.SMTPTransport.finishData(SMTPTransport.java:1149)
        at com.sun.mail.smtp.SMTPTransport.sendMessage(SMTPTransport.java:527)
        at javax.mail.Transport.send0(Transport.java:151)
        at javax.mail.Transport.send(Transport.java:80)
        at alt.javax.mail.TransportImpl.send(TransportImpl.java:18)
        at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:169)
        ... 7 more