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#MESSAGES STUCK IN OUTBOX 2016 HOW TO#
#MESSAGES STUCK IN OUTBOX 2016 SOFTWARE#
#MESSAGES STUCK IN OUTBOX 2016 OFFLINE#

#MESSAGES STUCK IN OUTBOX 2016 OFFLINE#

Launch Outlook again: this time it should start in Offline mode, hence the auto-send feature should not start.

Close Outlook (that will most likely be stuck into Outlook is transmitting the message mode…).

Start Outlook and activate the Offline mode: you can do that from the Send/Receive tab, and/or following these MS support guidelines.

Luckily enough, as pointed out by this great MS support post, the problem can be easily fixed by strategically using the Outlook Offline mode feature: this is what we can do to prevent Outlook to automatically try to send/move the e-mail message, allowing us to delete it.

#MESSAGES STUCK IN OUTBOX 2016 SOFTWARE#

When this happens, even restarting MS Outlook or even rebooting the machine won’t fix the issue, because the software will most likely go in auto-send (and auto-move in Sent folder) mode right after its initialization… thus blocking the offending message there. The fix, needless to say, is to find a way to delete the offending message from the Outbox folder: problem is, MS Outlook won’t usually allow to delete message that are in the process of being sent… or moved to the Sent folder… Which takes us back to square one.

#MESSAGES STUCK IN OUTBOX 2016 HOW TO#

The issue is often due to the fact that Outlook seems to be unable to move the e-mail message from the Outbox folder to the Sent folder – which is something that happens after the e-mail message has been actually sent: this makes it even worse, because it means that there’s an high chance that the receiver will be flooded by a number of identical e-mail messages until we figure out how to get rid of the problem. To do this, open the, when you send an e-mail message using MS Outlook, it might happen that it gets stuck in your Outbox folder: such a scenario happens to be fairly common when the e-mail message has some rather big attachments (2mb or more). You can set this value to 2 for the highest throughput. For a large volume of email, this translates to fewer messages in the queue because there will be more connections in parallel to transmit messages from the queue. The lower the threshold, the sooner that Exchange Server opens a new connection to Exchange Online. The SmtpConnectorQueueMessageCountThresholdForConcurrentConnections parameter determines how many messages in a queue will trigger the creation of another connection to the destination. SmtpConnectorQueueMessageCountThresholdForConcurrentConnections If your Exchange-based servers are primarily used to send to Exchange Online, you can change the following settings to optimize performance and avoid building large queues. This, in turn, limits the throughput of messages to Exchange Online. If a server that is running Exchange Server is configured to send all messages to Exchange Online for relaying or as part of hybrid configuration, these settings limit the number of parallel and total connections that are created. To make sure that those connections are not exhausted by sending to a single destination at the expense of others, the Exchange Server default settings restrict sending lots of mail to a single destination (FQDN of SendConnector/NextHopDomain), such as Exchange Online. CauseĮxchange Server is designed to create concurrent or parallel connections to send messages to multiple destinations. There are few or no deferrals (400-series SMTP response codes) from Exchange Online to account for the number of messages in the queue. In Microsoft Exchange Server 2019, 2016, or 2013, email messages may be stuck in on-premises message queues for several minutes if the server is configured to send to a single destination, such as Exchange Online.