Hello,
My server is hosted on AWS and runs SmarterMail on Linux. The server specifications are:
32 CPU cores
64 GB RAM
14 TB SSD storage
On a typical day, the load average stays between 1.5 and 2.0, with approximately 800 concurrent user connections consisting of:
As a maintenance measure, I restart the SmarterMail service every Sunday night because I notice that swap space gradually decreases over time, although it never drops below 6 GB.
My current connection limits are configured as follows:
IMAP: 5,000 maximum connections
XMPP: 300 maximum connections
POP: 500 maximum connections
The issue I'm experiencing is that I occasionally receive support calls from clients reporting that they cannot access Webmail, and IMAP access also stops working for them. When I log into Webmail using the affected user's account, the Inbox keeps spinning and never loads, as shown in the attached screenshots.
The only way I have found to resolve the issue is to manually drop that user's active connections, after which Webmail and IMAP immediately start working again.
I have attached screenshots for reference. Has anyone encountered a similar issue or have any suggestions on what could be causing this and how to prevent it?
Thank you.