Outgoing mail: Read timed out results in duplicate notifications

2012-03-23 14:24:33,050 ERROR [FHP-MAIL-BLD] Sending mailitem To='xxx@company.com' Subject='(HLP-18617) Account disabled' From='null' FromName='XXX (JIRA)' Cc='null' Bcc='null' ReplyTo='null' InReplyTo='null' MimeType='text/html' Encoding='UTF-8' Multipart='null' MessageId='null' ServiceRunner    Mail Queue Service Error occurred in sending e-mail: To='xxx@company.com' Subject='(HLP-18617) Account disabled' From='null' FromName='XXX (JIRA)' Cc='null' Bcc='null' ReplyTo='null' InReplyTo='null' MimeType='text/html' Encoding='UTF-8' Multipart='null' MessageId='null'
com.atlassian.mail.MailException: javax.mail.MessagingException: Exception reading response;
  nested exception is:
        java.net.SocketTimeoutException: Read timed out
        at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:183)
        at com.atlassian.mail.queue.SingleMailQueueItem.send(SingleMailQueueItem.java:38)
        at com.atlassian.mail.queue.MailQueueImpl.sendBuffer(MailQueueImpl.java:66)
        at com.atlassian.jira.service.services.mail.MailQueueService.run(MailQueueService.java:28)
        at com.atlassian.jira.service.JiraServiceContainerImpl.run(JiraServiceContainerImpl.java:61)
        at com.atlassian.jira.service.ServiceRunner.execute(ServiceRunner.java:47)
        at org.quartz.core.JobRunShell.run(JobRunShell.java:195)
        at com.atlassian.multitenant.quartz.MultiTenantThreadPool$MultiTenantRunnable.run(MultiTenantThreadPool.java:72)
        at org.quartz.simpl.SimpleThreadPool$WorkerThread.run(SimpleThreadPool.java:520)
Caused by: javax.mail.MessagingException: Exception reading response;
  nested exception is:
        java.net.SocketTimeoutException: Read timed out
        at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2153)
        at com.sun.mail.smtp.SMTPTransport.close(SMTPTransport.java:1186)
        at com.atlassian.mail.server.impl.SMTPMailServerImpl.send(SMTPMailServerImpl.java:162)
        ... 8 more
Caused by: java.net.SocketTimeoutException: Read timed out
        at java.net.SocketInputStream.socketRead0(Native Method)
        at java.net.SocketInputStream.read(Unknown Source)
        at com.sun.mail.util.TraceInputStream.read(TraceInputStream.java:110)
        at java.io.BufferedInputStream.fill(Unknown Source)
        at java.io.BufferedInputStream.read(Unknown Source)
        at com.sun.mail.util.LineInputStream.readLine(LineInputStream.java:89)
        at com.sun.mail.smtp.SMTPTransport.readServerResponse(SMTPTransport.java:2131)
        ... 10 more