Failed to send email for user... ERROR: 4.3.1 Insufficient system resources

[dana]

Hi,

We started to get an error message in some tasks, for some of the reipients:

Failed to send email for user .... ERROR: 4.3.1 Insufficient system resources (UsedDiskSpace[C:\Program Files\Microsoft\Exchange Server\V15\TransportRoles\data\Queue])

I don't find such a folder on disk C.

Didn't find any post with similar messages.

Can someone help me?

Thanks!

[Lucas_Gatling · Accepted solution]

@dana This is a Microsoft Exchange error message. Please check out this link I found online. It should provide some insight.

The possible reasons for this error include:

• Shortage of free disk space on which Exchange Hub Transport is queued.
• Back pressure when important resources are under the pressure.
• The volume used by Exchange drop-down or exceeds the specified free disk space threshold.

[dana]

Thanks, @Lucas_Gatling !

I will forward this to our support, and will let you know if it resolved the issue.