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Reasons of Email are Stuck in Outbox of Outlook

Errors always carry an erratic solution with detection in initial stage. At a point of time, it is always a user’s prime duty to start a self-examination for detecting the cause. There are various causes for the occurrences of error due to messages being stuck in outbox of Outlook.

  • Large attachment size
  • Authentication problem of Outlook
  • Offline mode is set in Outlook
  • Incorrect password for email account
  • No default account is set
  • All Outgoing emails are scanned through Anti virus

Workarounds to Overcome From The Issue

There are alternative solutions to deal with different causes related to Outlook Message being stuck in outbox that are discussed below:

Email Contains Large Attachment

Sometimes, user attaches an attachment with Email, which exceeds the size limit. However, this is one of the major issues why an Outlook message stuck in Out-box. To overcome from this error, there are two options, i.e.

1 - Remove the Stuck Email: User can easily remove an email by following the given steps:

  • Step 1: Select Send/Receive tab >> Work Offline
  • Step 2: Go to Outbox >> right-click message >> Delete

2 - Re-size the Attachment: Set Outlook at offline mode, then traverse to outbox folder. Now, drag the stuck message to draft folder for editing.

Incorrect Email Account Password

Many times, it happens when user changes the password of an email account then they also need to change the account password also if that account is configured in Outlook. To change the password in Outlook follow the steps given below that helps to remove the stuck message error occurrence.

  • Step 1: Open an Outlook >> Files >> Info >> Account Settings
  • Step 2: Choose the account in which password changing is required >> Change
  • Step 3: Enter your new password >> Next >> Finish

Authentication Is Not Set Properly

  • Step 1: Firstly, check settings of your email account in Outlook, Go to File >> Account Settings >> Email.
  • Step 2: Click on Account >> Tools menu >> Account Settings >> Email
  • Step 3: Now, switch to Outgoing server tab and check if all your settings match with those, which are provided by email provider. Do not check the option “Require Secure Password Authentication” unless the mail server requires this.
  • Step 3:Check the Outgoing Server port number is correct on the advanced tab

Check for Outlook Work Mode

To be connected, go to Send/Receive tab >> preferences group >> select Work Offline option to bring it back to online mode. If the messages are still stuck in Outlook, then there must be some internet connection problem.

Set An Account As Default

If the user is getting emails but is not able to reply on them then this situation can be overcome if the user set an account as default. For this, follow the steps below:

  • Go to account settings >> Emails
  • Select the desired account >> Click on set as default.


In the above discussion, various causes are discussed for the occurrence of an error caused due to outlook message stuck in outbox. As a result, various possible solutions are also discussed to resolve the error and improve the condition.

Outlook is considered as the best medium of communication in an organization. As Emails are an easy way and an accurate choice for sending large files. However, user sometimes faces an error as large Outlook message is stuck in outbox of Outlook while sending and message not send.

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