After upgrading from SmarterMail Build 8860 to Build 8895 we are seeing *VERY* long Spool delays of 10+ minutes or longer despite low CPU & Memory usage (5% and 44% reported outside of SM and 1% and 14% reported within SM). Our Incoming Gateways as of Build 8895 aren't able to process more than 20 messages per minute whereas before on Build 8860 they were able to handle a thousand or more per minute.
It looks like this may be related to the following in the Release Notes:
- Fixed: High memory usage related to RBLs and URIBLs.
SmarterMail is reporting a large number of timeouts (thousands per hour) for every RBL and especially for URIBLs (tens of thousands per hour).
We have eliminated that this isn't a DNS or RBL/URIBL issue as we have one Incoming Gateway on an older Build that is working fine with these same Antispam checks.
As our average peak Inbound is three times what SmarterMail Build 8895 can currently process, other than disabling AntisSpam checks entirely, putting our Inbound Gateways behind a Load Balancer, or rolling back to Build 8860 are there any other options to resolve this?