We've started getting the following in /var/log/mail.log:
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fatal: error reading lmdb:/opt/zimbra/data/postfix/data/postscreen_cache: MDB_CURSOR_FULL: Internal error - cursor stack limit reached
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warning: lmdb:/opt/zimbra/data/postfix/data/postscreen_cache: could not delete entry for g??
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~$ zmprov gacf |grep zimbraMtaPostscreen
zimbraMtaPostscreenAccessList: permit_mynetworks, cidr:/opt/zimbra/conf/postscreen_wblist
zimbraMtaPostscreenBareNewlineAction: ignore
zimbraMtaPostscreenBareNewlineEnable: no
zimbraMtaPostscreenBareNewlineTTL: 30d
zimbraMtaPostscreenBlacklistAction: enforce
zimbraMtaPostscreenCacheCleanupInterval: 12h
zimbraMtaPostscreenCacheRetentionTime: 7d
zimbraMtaPostscreenCommandCountLimit: 20
zimbraMtaPostscreenDnsblAction: enforce
zimbraMtaPostscreenDnsblMaxTTL: ${postscreen_dnsbl_ttl?{$postscreen_dnsbl_ttl}:{1}}h
zimbraMtaPostscreenDnsblMinTTL: 60s
zimbraMtaPostscreenDnsblSites: b.barracudacentral.org=127.0.0.2*7
zimbraMtaPostscreenDnsblSites: dnsbl.inps.de=127.0.0.2*7
zimbraMtaPostscreenDnsblSites: zen.spamhaus.org=127.0.0.[10;11]*8
zimbraMtaPostscreenDnsblSites: zen.spamhaus.org=127.0.0.[4..7]*6
zimbraMtaPostscreenDnsblSites: zen.spamhaus.org=127.0.0.3*4
zimbraMtaPostscreenDnsblSites: zen.spamhaus.org=127.0.0.2*3
zimbraMtaPostscreenDnsblSites: list.dnswl.org=127.0.[0..255].0*-2
zimbraMtaPostscreenDnsblSites: list.dnswl.org=127.0.[0..255].1*-3
zimbraMtaPostscreenDnsblSites: list.dnswl.org=127.0.[0..255].2*-4
zimbraMtaPostscreenDnsblSites: list.dnswl.org=127.0.[0..255].3*-5
zimbraMtaPostscreenDnsblSites: bl.mailspike.net=127.0.0.2*5
zimbraMtaPostscreenDnsblSites: bl.mailspike.net=127.0.0.[10;11;12]*4
zimbraMtaPostscreenDnsblSites: wl.mailspike.net=127.0.0.[18;19;20]*-2
zimbraMtaPostscreenDnsblSites: dnsbl.sorbs.net=127.0.0.10*8
zimbraMtaPostscreenDnsblSites: dnsbl.sorbs.net=127.0.0.5*6
zimbraMtaPostscreenDnsblSites: dnsbl.sorbs.net=127.0.0.7*3
zimbraMtaPostscreenDnsblSites: dnsbl.sorbs.net=127.0.0.8*2
zimbraMtaPostscreenDnsblSites: dnsbl.sorbs.net=127.0.0.6*2
zimbraMtaPostscreenDnsblSites: dnsbl.sorbs.net=127.0.0.9*2
zimbraMtaPostscreenDnsblTTL: 5m
zimbraMtaPostscreenDnsblThreshold: 8
zimbraMtaPostscreenDnsblTimeout: 10s
zimbraMtaPostscreenDnsblWhitelistThreshold: 0
zimbraMtaPostscreenGreetAction: enforce
zimbraMtaPostscreenGreetTTL: 1d
zimbraMtaPostscreenNonSmtpCommandAction: drop
zimbraMtaPostscreenNonSmtpCommandEnable: no
zimbraMtaPostscreenNonSmtpCommandTTL: 30d
zimbraMtaPostscreenPipeliningAction: enforce
zimbraMtaPostscreenPipeliningEnable: no
zimbraMtaPostscreenPipeliningTTL: 30d
zimbraMtaPostscreenWatchdogTimeout: 10s
zimbraMtaPostscreenWhitelistInterfaces: static:all