好的，我在全新安装的 ubuntu 18.04 LTS 上安装了 Kolab 16 作为邮件包。Kolab (v16) 包括 clamav、roundcubemail、postfix、amavis 和一些其他组件，将它们整合在一起。它一直运行良好，直到两天前我的机器上推送了无人值守升级。之后，它停止接受新邮件（或看起来如此）。它也不再发送邮件。
我愿意接受任何有关此事的帮助。
以下是升级日志：
Start-Date: 2020-05-22 06:27:48
Commandline: /usr/bin/unattended-upgrade
Upgrade: libclamav9:amd64 (0.102.2+dfsg-0ubuntu0.18.04.1, 0.102.3+dfsg-0ubuntu0.18.04.1)
End-Date: 2020-05-22 06:27:50
Start-Date: 2020-05-22 06:27:52
Commandline: /usr/bin/unattended-upgrade
Upgrade: clamav:amd64 (0.102.2+dfsg-0ubuntu0.18.04.1, 0.102.3+dfsg-0ubuntu0.18.04.1)
End-Date: 2020-05-22 06:27:55
Start-Date: 2020-05-22 06:27:57
Commandline: /usr/bin/unattended-upgrade
Upgrade: qemu-system-x86:amd64 (1:2.11+dfsg-1ubuntu7.25, 1:2.11+dfsg-1ubuntu7.26), qemu-kvm:amd64 (1:2.11+dfsg-1ubuntu7.25, 1:2.11+dfsg-1ubuntu7.26)
End-Date: 2020-05-22 06:28:02
Start-Date: 2020-05-22 06:28:04
Commandline: /usr/bin/unattended-upgrade
Upgrade: qemu-utils:amd64 (1:2.11+dfsg-1ubuntu7.25, 1:2.11+dfsg-1ubuntu7.26), qemu-block-extra:amd64 (1:2.11+dfsg-1ubuntu7.25, 1:2.11+dfsg-1ubuntu7.26), qemu-system-common:amd64 (1:2.11+dfsg-1ubuntu7.25, 1:2.11+dfsg-1ubuntu7.26)
End-Date: 2020-05-22 06:28:12
Start-Date: 2020-05-22 06:28:15
Commandline: /usr/bin/unattended-upgrade
Upgrade: clamav-daemon:amd64 (0.102.2+dfsg-0ubuntu0.18.04.1, 0.102.3+dfsg-0ubuntu0.18.04.1), clamdscan:amd64 (0.102.2+dfsg-0ubuntu0.18.04.1, 0.102.3+dfsg-0ubuntu0.18.04.1), clamav-base:amd64 (0.102.2+dfsg-0ubuntu0.18.04.1, 0.102.3+dfsg-0ubuntu0.18.04.1)
End-Date: 2020-05-22 06:28:31
Start-Date: 2020-05-22 06:28:33
Commandline: /usr/bin/unattended-upgrade
Upgrade: clamav-freshclam:amd64 (0.102.2+dfsg-0ubuntu0.18.04.1, 0.102.3+dfsg-0ubuntu0.18.04.1)
End-Date: 2020-05-22 06:28:39
Start-Date: 2020-05-22 06:28:41
Commandline: /usr/bin/unattended-upgrade
Upgrade: libvirt-clients:amd64 (4.0.0-1ubuntu8.16, 4.0.0-1ubuntu8.17), libvirt-daemon-driver-storage-rbd:amd64 (4.0.0-1ubuntu8.16, 4.0.0-1ubuntu8.17), libvirt-daemon-system:amd64 (4.0.0-1ubuntu8.16, 4.0.0-1ubuntu8.17), libvirt0:amd64 (4.0.0-1ubuntu8.16, 4.0.0-1ubuntu8.17), libvirt-daemon:amd64 (4.0.0-1ubuntu8.16, 4.0.0-1ubuntu8.17)
End-Date: 2020-05-22 06:29:03
以下是“clamconf”的输出
# ./clamconf
Checking configuration files in /etc/clamav
Config file: clamd.conf
-----------------------
AlertExceedsMax disabled
PreludeEnable disabled
PreludeAnalyzerName = "ClamAV"
LogFile = "/var/log/clamav/clamav.log"
LogFileUnlock disabled
LogFileMaxSize = "4294967295"
LogTime = "yes"
LogClean disabled
LogSyslog disabled
LogFacility = "LOG_LOCAL6"
LogVerbose disabled
LogRotate = "yes"
ExtendedDetectionInfo = "yes"
PidFile disabled
TemporaryDirectory disabled
DatabaseDirectory = "/var/lib/clamav"
OfficialDatabaseOnly disabled
LocalSocket = "/var/run/clamav/clamd.ctl"
LocalSocketGroup = "clamav"
LocalSocketMode = "666"
FixStaleSocket = "yes"
TCPSocket disabled
TCPAddr disabled
MaxConnectionQueueLength = "15"
StreamMaxLength = "26214400"
StreamMinPort = "1024"
StreamMaxPort = "2048"
MaxThreads = "12"
ReadTimeout = "180"
CommandReadTimeout = "30"
SendBufTimeout = "200"
MaxQueue = "100"
IdleTimeout = "30"
ExcludePath disabled
MaxDirectoryRecursion = "15"
FollowDirectorySymlinks disabled
FollowFileSymlinks disabled
CrossFilesystems = "yes"
SelfCheck = "3600"
DisableCache disabled
VirusEvent disabled
ExitOnOOM disabled
AllowAllMatchScan = "yes"
Foreground disabled
Debug disabled
LeaveTemporaryFiles disabled
User = "clamav"
Bytecode = "yes"
BytecodeSecurity = "TrustSigned"
BytecodeTimeout = "60000"
BytecodeUnsigned disabled
BytecodeMode = "Auto"
DetectPUA disabled
ExcludePUA disabled
IncludePUA disabled
ScanPE = "yes"
ScanELF = "yes"
ScanMail = "yes"
ScanPartialMessages disabled
PhishingSignatures = "yes"
PhishingScanURLs = "yes"
HeuristicAlerts = "yes"
HeuristicScanPrecedence disabled
StructuredDataDetection disabled
StructuredMinCreditCardCount = "3"
StructuredMinSSNCount = "3"
StructuredSSNFormatNormal = "yes"
StructuredSSNFormatStripped disabled
ScanHTML = "yes"
ScanOLE2 = "yes"
AlertBrokenExecutables disabled
AlertEncrypted disabled
AlertEncryptedArchive disabled
AlertEncryptedDoc disabled
AlertOLE2Macros disabled
AlertPhishingSSLMismatch disabled
AlertPhishingCloak disabled
AlertPartitionIntersection disabled
ScanPDF = "yes"
ScanSWF = "yes"
ScanXMLDOCS = "yes"
ScanHWP3 = "yes"
ScanArchive = "yes"
ForceToDisk disabled
MaxScanTime = "120000"
MaxScanSize = "104857600"
MaxFileSize = "26214400"
MaxRecursion = "16"
MaxFiles = "10000"
MaxEmbeddedPE = "10485760"
MaxHTMLNormalize = "10485760"
MaxHTMLNoTags = "2097152"
MaxScriptNormalize = "5242880"
MaxZipTypeRcg = "1048576"
MaxPartitions = "50"
MaxIconsPE = "100"
MaxRecHWP3 = "16"
PCREMatchLimit = "10000"
PCRERecMatchLimit = "5000"
PCREMaxFileSize = "26214400"
OnAccessMountPath disabled
OnAccessIncludePath disabled
OnAccessExcludePath disabled
OnAccessExcludeRootUID disabled
OnAccessExcludeUID disabled
OnAccessExcludeUname disabled
OnAccessMaxFileSize = "5242880"
OnAccessDisableDDD disabled
OnAccessPrevention disabled
OnAccessExtraScanning disabled
OnAccessCurlTimeout = "5000"
OnAccessMaxThreads = "5"
OnAccessRetryAttempts disabled
OnAccessDenyOnError disabled
DevACOnly disabled
DevACDepth disabled
DevPerformance disabled
DevLiblog disabled
DisableCertCheck disabled
AlgorithmicDetection = "yes"
BlockMax disabled
PhishingAlwaysBlockSSLMismatch disabled
PhishingAlwaysBlockCloak disabled
PartitionIntersection disabled
OLE2BlockMacros disabled
ArchiveBlockEncrypted disabled
Config file: freshclam.conf
---------------------------
LogFileMaxSize = "4294967295"
LogTime = "yes"
LogSyslog disabled
LogFacility = "LOG_LOCAL6"
LogVerbose disabled
LogRotate = "yes"
PidFile disabled
DatabaseDirectory = "/var/lib/clamav"
Foreground disabled
Debug disabled
UpdateLogFile = "/var/log/clamav/freshclam.log"
DatabaseOwner = "clamav"
Checks = "24"
DNSDatabaseInfo = "current.cvd.clamav.net"
DatabaseMirror = "db.local.clamav.net", "database.clamav.net"
PrivateMirror disabled
MaxAttempts = "5"
ScriptedUpdates = "yes"
TestDatabases = "yes"
CompressLocalDatabase disabled
ExtraDatabase disabled
ExcludeDatabase disabled
DatabaseCustomURL disabled
HTTPProxyServer disabled
HTTPProxyPort disabled
HTTPProxyUsername disabled
HTTPProxyPassword disabled
HTTPUserAgent disabled
NotifyClamd = "/etc/clamav/clamd.conf"
OnUpdateExecute disabled
OnErrorExecute disabled
OnOutdatedExecute disabled
LocalIPAddress disabled
ConnectTimeout = "30"
ReceiveTimeout = "30"
SafeBrowsing disabled
Bytecode = "yes"
clamav-milter.conf not found
Software settings
-----------------
Version: 0.102.3
Optional features supported: MEMPOOL IPv6 FRESHCLAM_DNS_FIX AUTOIT_EA06 BZIP2 LIBXML2 PCRE ICONV JSON JIT
Database information
--------------------
Database directory: /var/lib/clamav
daily.cld: version 25821, sigs: 2465067, built on Sat May 23 05:21:31 2020
bytecode.cvd: version 331, sigs: 94, built on Thu Sep 19 09:12:33 2019
main.cvd: version 59, sigs: 4564902, built on Mon Nov 25 05:56:15 2019
Total number of signatures: 7030063
Platform information
--------------------
uname: Linux 4.15.0-101-generic #102-Ubuntu SMP Mon May 11 10:07:26 UTC 2020 x86_64
OS: linux-gnu, ARCH: x86_64, CPU: x86_64
Full OS version: Ubuntu 18.04.4 LTS
zlib version: 1.2.11 (1.2.11), compile flags: a9
Triple: x86_64-pc-linux-gnu
CPU: ivybridge, Little-endian
platform id: 0x0a2172720807050001070500
Build information
-----------------
GNU C: 7.5.0 (7.5.0)
GNU C++: 7.5.0 (7.5.0)
CPPFLAGS: -Wdate-time -D_FORTIFY_SOURCE=2
CFLAGS: -g -O2 -fdebug-prefix-map=/build/clamav-pK3ANb/clamav-0.102.3+dfsg=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64
CXXFLAGS: -g -O2 -fdebug-prefix-map=/build/clamav-pK3ANb/clamav-0.102.3+dfsg=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -D_FILE_OFFSET_BITS=64
LDFLAGS: -Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed
Configure: '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=/usr/include' '--mandir=/usr/share/man' '--infodir=/usr/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--disable-silent-rules' '--libdir=/usr/lib/x86_64-linux-gnu' '--libexecdir=/usr/lib/x86_64-linux-gnu' '--runstatedir=/run' '--disable-maintainer-mode' '--disable-dependency-tracking' 'CFLAGS=-g -O2 -fdebug-prefix-map=/build/clamav-pK3ANb/clamav-0.102.3+dfsg=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -D_FILE_OFFSET_BITS=64' 'CPPFLAGS=-Wdate-time -D_FORTIFY_SOURCE=2' 'CXXFLAGS=-g -O2 -fdebug-prefix-map=/build/clamav-pK3ANb/clamav-0.102.3+dfsg=. -fstack-protector-strong -Wformat -Werror=format-security -Wall -D_FILE_OFFSET_BITS=64' 'LDFLAGS=-Wl,-Bsymbolic-functions -Wl,-z,relro -Wl,-z,now -Wl,--as-needed' '--with-dbdir=/var/lib/clamav' '--sysconfdir=/etc/clamav' '--disable-clamav' '--disable-unrar' '--enable-milter' '--enable-dns-fix' '--with-libjson' '--with-system-libmspack' '--with-libcurl=/usr' '--with-gnu-ld' '-with-system-llvm=/usr/bin/llvm-config-3.9' '--with-llvm-linking=dynamic' '--with-systemdsystemunitdir=/lib/systemd/system' 'build_alias=x86_64-linux-gnu' 'OBJCFLAGS=-g -O2 -fdebug-prefix-map=/build/clamav-pK3ANb/clamav-0.102.3+dfsg=. -fstack-protector-strong -Wformat -Werror=format-security'
sizeof(void*) = 8
Engine flevel: 114, dconf: 114