Fabio Sangiovanni wrote:
I'm using policyd to throttle incoming mail (size over time against sasl_username) and I'm experiencing a strange delay during submission. In particular, it seems some kind of delay due to policyd execution, and it's about 1 second per message.
I hit a similar issue which is documented in a thread entitled "Performance issues - restricted mail handling" from April 2011. In the end I concluded that Postfix gives the appearance of having some sort of throughput issue when calling an external policy server - I found a limit of about 2 calls/second/smtp process. Since this is per-process, it scales with the number of connections and since it won't generally be an issue for me I never took it any further. I haven't done any tests to see it it's still an issue (the boxes/software have been upgraded since then).
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