The solution to the problem lies in increasing the server timeout from the default 1 minute. When the server timeout is reached, Outlook resubmits the message in the Outbox to the next Send/Receive time slot.Ī duplicate is created because though the message was submitted to the mail server, an acknowledgment was not received before the timeout and hence the message will be resubmitted. When the user’s internet connection is very slow or unreliable then it is possible that the server timeout is reached which by default is a minute. POP3 and IMAP accounts tell the Outlook to consider the connection as ‘lost’ when no server response has been received after a certain amount of time elapse. Tools -> Options -> Mail Setup tab -> Send/Receiveįile -> Options -> Advanced -> Send/Receive The method to change the send/receive interval is: But when the user has more than 3 accounts it is better to set the time interval to around 10 minutes and not lower than that. So take care not to set it lower than 5 minutes. When the dialog box shows more than 2 tasks per email account, know that your send/receive interval is too short. Tools -> Send/Receive Settings -> Show Progress Open the Send/receive dialog box to check the progress or the backlog: This causes a backlog and hence duplicates are created because the messages which could not be sent in the Outbox are resubmitted again and again.
When the email which you are sending takes a while to upload and your send/receive interval is too short, maybe less than 2 minutes, then it can happen that the next send/receive interval has started before the email has been sent. When properly disabled, the virus scanner will not put the user at risk and moreover, the problem Outlook is sending multiple copies of an email will also get resolved. Thus it is better the user disables or uninstalls the integration capability of the scanner for Outlook. The virus scanner integrates itself with Outlook and scans the outgoing emails. Virus scanners throughout the years have been proved to cause issues to Outlook.
Emails stuck in outbox office 365 mac full#
When the Send/ Receive Interval is set to a very short time then there are full chances of the occurrence of the above error.When you have a virus scanner that integrates with Outlook.Could you please help me solve this issue to remove duplicate Outlook emails so that it behaves and sends only one copy? Reasons Why Outlook is Sending Multiple Copies of an Email
And sometimes Outlook says that the emails have been sent, but are still sitting pretty in the Outbox. Outlook is sending multiple copies of an email, maybe 20-30 of some emails occasionally and keeps the email in the Outbox with the indication that the email hasn’t been sent. I have a strange problem while sending emails usually the one with attachments. Modified: T16:54:39+00:00| Outlook, Technology, Tips | 5 Minutes Reading
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