Anyone here got more experience of UPS monitoring than I have?

I have a UPS configured and working, however it periodically loses communications. I'm not too concerned about that - the server is due for replacement in the next couple of months anyway - but the comms errors are generating emails that I'd like to tweak so they're not filling my inbox.

My inbox is filled with COMMBAD emails, followed within seconds (under a minute, usually) by COMMOK. So I'd like to put a delay on the triggering of a warning.

The parameter that looks right is NOCOMMWARNTIME in /etc/upsmon.conf, but it defaults to 300s (5 min) anyway; I upped it to 600s (10min) with no change. I think on re-reading the man pages that this affects how often the warning is sent once triggered, not how long after detection the first warning gets sent.

The emails get sent to a dedicated "systems" mailbox that should only get stuff that needs action, so getting a COMMBAD/COMMOK pair every few hours is quite frustrating. But turning off monitoring altogether seems like a bad "fix".

Any suggestions?