Concurrent Email Notifications Not Delivered

Hello David,

I hope all is well with you and your family. Our daily ticket volume has grown exponentially over the past year. Increasingly, we have multiple tickets being opened or a new ticket and a admin reply at the same time. When this happens, only one of the email notifications is delivered. For example, we had a end-user open Ticket #20308 at 12:33pm. At the same time, a technician replied to Ticket #20161. The email notification for Ticket #20308 was delivered but was not delivered for #20161. Do you have any idea what would cause this?

I setup a fresh test install on another server and was able to reproduce the issue.

Thank you in advance for your assistance!

Mike Bauer