![]() There are several reasons and all of them are discussed below: It is better to understand the why does email stuck in Outlook data file outbox in MS Outlook 2016, 2013, 2010, 2007, 2003 versions in Windows 10, 8, 7 OS, so that a user can avoid it in the future from occurring. ![]() How does Some Email Gets Hung Up in Outlook Outbox? This will help users in preventing such a situation in the future. Therefore, before switching to its fixes directly, it is important to understand the why does email stuck in outbox of Outlook. ![]() Every problem must have some or other reason behind it. It is the most common problem faced by the Outlook users and they want to get rid off this problem as soon as possible. ![]() Emails are not received by the respective recipient and get trapped in Outbox. It means Outlook is not sending email even a user is clicked on the send/ receive button. Whenever a user tries to send an email and it goes to Outbox instead of sent items folder and gets traps there. One of the most frustrating issues faced by Outlook 2016 and below versions users is email messages with attachments stuck in Outbox. Explore in detail to find how to get rid of an email stuck in Outlook outbox in Windows OS in Outlook 2016, 2013, 2010, 2007 and lower editions. In this blog, we have covered all about this problem i.e., how email gets hung up in Outlook outbox, its reasons and solutions. Our other concern is users who would be working from home or on the road with data limited plans and dealing with this constant sending of data.Raj Kumar ~ Modified: T12:34:02+00:00 ~ Outlook Error ~Īre you tired of sending email again and again but it gets trapped in Outbox folder? You face this issue most of the times, and want to know the exact cause why does email stuck in outbox of Outlook? No need to worry, you are in the right place. Basically we see TBs of data leaving, and none of it ends up in any place we can see in our Office365 environment such as SharePoint. Our main concern is some sort of new malware that latches onto outlook to exfiltrate data through a bug in it's caching mode. Downloads are in the <20 GB range for this user. What exactly could be happening in outlook that caching would need to upload 5 TB of data? I would expect a higher download, not upload. In testing, we found that disabling outlook cached mode in mail settings control panel stops this issue from occuring. SharePoint/mailbox size/one drive show no more unitization from that user than normal. This makes more sense until it gets to the TB range, way more than the PC has storage. Firewall monitoring also agrees, showing a lot of traffic to "". This is all coming from Outlook, and looking in the task manager outlook was at a constant 25-30 Mbps send speed. One user is sitting at about 5 TB outgoing data over the last seven days, way more than even our offsite backups. We've been seeing 2 users with very high outgoing bandwidth. ![]()
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