I have a strange one... I recently upgraded the server hardware to a new and much faster server for a customer. We are running zimbra (v6.0.7_GA_2473) on SLES 10 32-bit inside a VM on ESXi 4.1. Our original host was running ESXi 4.0.
Everything has been much faster across the board with the exception of sending emails. When you click send in the zimbra webui, there can be a delay of anywhere from nothing noticeable (<1s) to painful (>10s) before the message sends and the UI returns to normal.
In the attached txt file, you can see a time when there is a 10s delay between the soap SendMsgRequest, mailop and the SMTP Sending Message.
I don't see any errors being thrown... I verified our DNS servers...
Looking at the running processes, I see java and amavisd processes just after the send button is pressed. Then there is a period of dead time when nothing is happening... Finally another java and amavisd processes occurs that I can't seem to catch the full java command. I included in the attached file a snapshot of top from the exact moment the webui returns to normal and announces that the message was sent.
Thanks! -Cheers, Peter.