• Raised Listmonk memory limit to 512
• Raised postgresql memory limit to 2 GB

And in Listmonk SMTP settings:

• Max connections to 25
• Idle timeout to 2m, Wait timeout to 5m

I am still getting the "AxiosError: Network Error" on any analytics page on Listmonk.

Note that in the past I have been able to send campaigns to large lists without changing any of these default settings, but my server has been under increased load lately.

I would appreciate any further guidance on best practices from @girish or anyone else. Thanks!

Update: two days later, this setup did NOT work for my 900 person email list. I got an even lower view count than before, with more errors.

Analytics are still not loading, even with memory raised on the db and the app.

Is there anything else I can do? Here is the error I'm seeing in the logs, over and over:

manager.go:392: error sending message in campaign March 2023 - Sacred Stacks: subscriber f3739c80-1055-44a4-9636-476a5c3b50a8: timed out waiting for free conn in pool

One other thing I'm noticing is an "AxiosError: Network Error" when I try to view the analytics on a campaign. Any idea what might be causing that?

One thing I would do is to add your email addresses multiple times (like ntnsdr+1@foo.com, ntnsdr+2@foo.com and so on). Then, click on the emails. Check if the view count is reliably changing.