Administrator's Guide - Kerio Software Archive

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Chapter 16 Antispam control of the SMTP serverNote: SpamAssassin checks only messages which do not exceed the size of 128 KB since spammessages are mostly not so large and checking of large messages might overload or slow downthe server’s performance.Since individual users must check the messages in the “Learn” mode, the spam evaluationtools must be embedded in mail clients. By default, these tools include only MS Outlook withthe Kerio Outlook Connector and the Kerio WebMail interface. Users can click special buttonsin the toolbar to mark an incorrectly evaluated message as non-spam.For email clients with IMAP accounts as well as for MS Entourage (for IMAP and Exchangeaccounts), there is another method of how to teach the Bayesian filter. These users can markincorrectly classified messages by moving them to appropriate folders. If users want to marka message as spam, they can move such messages to Junk E-mail. To mark a message as notspam, they can move it to Inbox.TIP: To use this method as efficiently as possible, set users a spam rule (either when creatinguser accounts in Kerio MailServer or by defining a corresponding sieve rule for incoming mail).Any messages marked by Kerio MailServer as spam will be automatically moved to the JunkE-Mail folder. Messages that are incorrectly marked as spam can be moved to Inbox by hand.Spam messages let in by mistake can be moved to the Spam folder manually. This ensuresproper and efficient learning and improvement of the Bayesian filter.Online SURBL databaseThis part of the filter tests contents of messages (links to websites possibly included in messagebodies) against special online databases.SpamAssassin can use multiple online databases. In Kerio MailServer, it, however, uses onlythe SURBL database since the other databases are already used for other tests.16.5 Email policy records checkMany spam emails are sent from a fake sender email address. Checking “email policy” recordsis used for filtering such messages.The check verifies whether IP addresses of the remote SMTP server are authorized to sendemails to the domain specified. Spammers thus have to use their real addresses and theunsolicited emails can be recognized quickly using different blacklists.There are two similar technologies available for performing “email policy” records check inKerio MailServer. The first one is Caller ID created by Microsoft, the other one is a projectnamed SPF (Sender Policy Framework). Both technologies provide explicit verification of messagesenders. During this verification process, the IP addresses of SMTP servers that sendmail from the specific domain are published. For each domain that supports at least one ofthe above technologies, a TXT record is stored in DNS with a list of IP addresses that sendemail from the specific domain. Kerio MailServer then compares the IP address of the SMTPserver with IP addresses contained in this DNS record. This method guarantee verification of184
16.5 Email policy records checksender’s trustworthiness for each message. If the DNS record does not contain the IP addressthe message was sent from, such message has a falsified address and it is considered as spam.This way, it is quite easy to distinguish, whether the message is spam or not.Messages received from server that has no IP address list in the DNS record will be alwaysdelivered. For the “email policy” purposes, these emails will not be considered.To set Caller ID and SPF in Kerio MailServer, use the tabs in Caller ID (Spam filter → Caller ID)and SPF (Spam filter → SPF) menu.Warning: SPF and Caller ID can be applied only to email delivered by SMTP. If email is downloadedfrom the domain mailbox by POP3 protocol, email policy logs will not work.Caller IDThe Caller ID tab enables users to configure basic settings:Figure 16.8Caller ID tabCheck the Caller ID of every incoming messageThis option enables/disables Caller ID.On the Relay Control tab in the SMTP server section, it is possible to define a group oftrustworthy IP addresses. Caller ID will not be checked in case of messages sent fromtrustworthy IP addresses (for details, see chapter 15.2).185
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Administrator’s GuideKerio Techno
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36 Support for ActiveSync . . . . .
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Chapter 1 IntroductionPersonal and
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1.2 Quick ChecklistBlackBerry suppo
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1.2 Quick Checklist11. If email for
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2.2 Conflicting software2.2 Conflic
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2.4 InstallationBy default, Kerio M
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2.4 InstallationSelect a folder whe
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2.4 InstallationFigure 2.5Custom in
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2.4 InstallationKerio MailServer En
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2.4 InstallationThe product support
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2.4 Installation(Kerio Administrati
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2.5 Configuration WizardNote: The c
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2.5 Configuration WizardFigure 2.16
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2.6 Upgrade and UninstallationWhen
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Chapter 3Product Registration and L
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3.2 Registration with the administr
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3.2 Registration with the administr
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3.3 License information and import
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3.4 Licensing policyOnce number of
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4.1 Kerio MailServer MonitorFigure
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4.2 Standalone processes of the ser
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5.2 Administration WindowThe same d
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5.2 Administration WindowStatus bar
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Chapter 6ServicesIn Configuration
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6.1 Service Parameter Settings• a
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6.1 Service Parameter SettingsFigur
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6.3 TroubleshootingFigure 6.5The De
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Chapter 7DomainsKerio MailServer ca
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7.2 GeneralFigure 7.2Domain setting
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7.4 FootersFigure 7.3Domain setting
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7.5 ForwardingFigure 7.5Domain sett
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7.6 Setting of Directory ServicesFi
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7.6 Setting of Directory ServicesFi
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7.7 Advanced7.7 AdvancedIn the Adva
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7.8 WebMail Logo3. In the Logging m
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8.2 Sending High Priority MessagesW
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Chapter 9SchedulingKerio MailServer
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9.2 Optimal Scheduling9.2 Optimal S
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10.1 Kerio MailServer CertificateFi
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10.1 Kerio MailServer Certificate
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10.2 Install certificates on client
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11.3 LanguageIf there is one of the
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11.3 LanguageFigure 11.1Dictionary
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12.2 Time IntervalsClick on Add to
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12.3 Setting Remote AdministrationF
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10312.3 Setting Remote Administrati
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13.2 Creating a user accountWarning
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13.2 Creating a user accountFigure
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13.2 Creating a user accountStore p
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13.2 Creating a user accountNote: T
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13.2 Creating a user accountFigure
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13.3 Editing User AccountNote: When
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13.5 Removing user accountsKerio Ma
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13.9 Administration of mobile devic
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13.9 Administration of mobile devic
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13.10 Import Users• MailAddress
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13.10 Import UsersFor detailed info
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13.10 Import UsersFigure 13.24Impor
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13.12 User Account TemplatesNote: C
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Chapter 14User groupsUser accounts
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Page 135 and 136: 14.1 Creating a User GroupPublish t
Page 137 and 138: 15.1 Mail Delivery over the Interne
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Page 141 and 142: 15.2 SMTP serverinterface originall
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Page 145 and 146: 15.2 SMTP serverLimit maximum incom
Page 147 and 148: 15.3 AliasesMaximum number of deliv
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Page 151 and 152: 15.4 remote POP3 mailboxesFigure 15
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Page 157 and 158: 15.6 Advanced OptionsDescriptionA c
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Page 167 and 168: 15.6 Advanced Optionsstartup of the
Page 169 and 170: 15.6 Advanced OptionsKerio WebMail
Page 171 and 172: 16.1 Spam Rating tab16.1 Spam Ratin
Page 173 and 174: 16.2 Blacklists tabtration Console
Page 175 and 176: 16.2 Blacklists tabInternet databas
Page 177 and 178: 16.3 Custom RulesSORBSSpam and Open
Page 179 and 180: 16.3 Custom RulesUse the Add button
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Page 201 and 202: 17.5 Filtering Email Attachments17.
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Page 205 and 206: 18.1 ArchivingPath to the archive d
Page 207 and 208: 18.2 Backup of user foldersFigure 1
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Page 215 and 216: Chapter 19LDAP serverThe built-in L
Page 217 and 218: 19.2 Configuring Email ClientsFigur
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Page 221 and 222: 20.2 Creating a Mailing List• con
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Page 225 and 226: 20.3 Posting rulesFigure 20.4Creati
Page 227 and 228: 20.4 Moderators and MembersAdd this
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Chapter 21Status InformationKerio M
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21.2 Message queue processingFrom,
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21.3 Active ConnectionsActive Conne
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21.4 Opened FoldersComponentsThree
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21.5 Traffic ChartsTime rangeIn the
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21.6 StatisticsRefreshThis button r
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22.1 Log settingsFigure 22.2Save lo
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22.1 Log settingsLog debugSelect th
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22.3 MailAuth_type=’0’, Passwor
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22.4 SecurityMailing list messagesT
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22.4 SecurityAntibombingServer over
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22.8 Debug• From: jsmith@company.
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22.8 Debug• IMAP Server — commu
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22.9 Performance Monitor (under Win
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23.1 Viewing public folders in indi
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24.1 Kerio MailServer on WindowsFig
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24.1 Kerio MailServer on WindowsFig
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24.2 Kerio MailServer on LinuxExamp
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24.2 Kerio MailServer on Linuxdebug
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24.3 Kerio MailServer on Mac OSTo e
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24.3 Kerio MailServer on Mac OSFigu
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24.4 Starting Open Directory and Ke
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24.4 Starting Open Directory and Ke
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Figure 25.1Setting Windows NT domai
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25.1 Setting NTLM in MS Outlook ext
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Chapter 26Kerio MailServer Environm
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26.3 FirewallFrom technical reasons
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Chapter 27Deployment ExamplesThis c
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27.2 Dial-up Line + Domain Mailboxi
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27.4 A company with multiple sites5
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27.4 A company with multiple sitesF
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27.5 Setting up the backup mail ser
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Chapter 28Troubleshooting in Kerio
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28.2 Configuration Backup and Trans
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29.1 Installation of Active Directo
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29.3 User Account DefinitionFigure
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Chapter 30Kerio Open Directory Exte
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Chapter 31KMS Web AdministrationKMS
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31.2 Setting access rights to the w
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31.5 Page headerFigure 31.4Web Admi
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31.6 Welcome pageLocalizations of K
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31.7 User accountsFigure 31.8Templa
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31.7 User accountsFigure 31.10User
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31.7 User accountsFigure 31.12User
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31.8 User groupsMove user’s messa
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31.8 User groupsFigure 31.16Group a
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31.9 AliasesPublish this group info
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31.9 AliasesFigure 31.20Alias creat
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32.1 Kerio Outlook Connector (Offli
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32.2 Kerio Outlook ConnectorFigure
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32.2 Kerio Outlook ConnectorTIP: If
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32.2 Kerio Outlook ConnectorUse the
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32.2 Kerio Outlook ConnectorNote: I
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33.1 Installation• MS Outlook 200
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33.1 InstallationNote: Kerio Synchr
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34.2 Windows Calendar34.2 Windows C
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Chapter 35CalDAV supportSince 6.5.0
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Chapter 36Support for ActiveSyncSup
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36.2 Supported versions of ActiveSy
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36.3 RoadSyncabcdeDevice typeEmail
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36.4 SSL encryptionWarning: It is n
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36.5 Remote deletion of the device
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36.6 Removing a device from the adm
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36.8 Troubleshooting36.8 Troublesho
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Chapter 37Support for BlackBerry vi
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If any problem occurs regarding com
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Chapter 40Kerio Sync Connector for
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Figure 40.2Log settings in Kerio Sy
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Apple Mail options and settings are
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42.1 Email42.1 EmailOn Apple iPhone
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43.1 Contacts43.1 ContactsUSAKerio
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Nokia ® and Mail for Exchange ® a
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arising from, out of or in connecti
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Glossary of termsApplication protoc
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MX RecordsOne of the record types t
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IndexAaccess rightsgroups 131accoun
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mailing lists 220MAPI 396master aut
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