On 3/25/22 16:17, dancab@caltech.edu wrote:
Mail delivery is continuing at a snails pace and it is now 4 hours behind.
I noticed that the system isn't overloaded either via CPU or Memory. It's just slowly "working on it".
Are there rate limits that can be tuned for Mailman queues such as the "out" queue? Could this be IO related somehow? I'd expect there to be a CPU spike in that case.
There are things that can be done. One big performance killer is MTA recipient checks during SMTP from Mailman. Look too at the various hits at <https://wiki.list.org/?action=fullsearch&value=performance&titlesearch=Titles>. These are written for older Mailman, but the MTA advice is relevant.
One thing you can do is enable an alternate SMTPD port in the MTA with minimal checking and configure Mailman to use that port.
-- Mark Sapiro <mark@msapiro.net> The highway is for gamblers, San Francisco Bay Area, California better use your sense - B. Dylan