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ProSecure Web/Email Security Threat Management (STM) Appliance Reference Manual
Content Filtering and Optimizing Scans 4-15
v1.0, September 2009
2. Blacklist. E-mails from the specified sources are considered spam and are blocked.
3. Real-time blacklist. E-mails from known spam sources that are collected by blacklist
providers are blocked.
4. Distributed spam analysis. E-mails that are detected as spam by the NETGEAR Spam
Classification Center are either tagged, blocked, or quarantined.
This order of implementation ensures the optimum balance between spam prevention and system
performance. For example, if an e-mail originates from a whitelisted source, the STM delivers the
e-mail immediately to its destination inbox without implementing the other spam prevention
technologies, thereby speeding up mail delivery and conserving the STM system resources.
However, regardless of whether or not an e-mail is whitelisted, it it still be scanned by the STM’s
anti-malware engines.
You can configure these anti-spam options in conjunction with content filtering to optimize
blocking of unwanted mails.
Setting Up the Whitelist and Blacklist
You can specify e-mails that are accepted or blocked based on the originating IP address, domain,
and e-mail address by setting up the whitelist and blacklist. You can also specify e-mails that are
accepted based on the destination domain and e-mail address.
The whitelist ensures that e-mail from listed (that is, trusted) sources and recipients are not
mistakenly tagged as spam. E-mails going to and from these sources and recipients are delivered to
their destinations immediately, without being scanned by the anti-spam engines. This can help to
speed up the system and network performance. The blacklist, on the other hand, lists sources from
which all e-mail messages are blocked You can enter up to 200 entries per list, separated by
commas.
Note: E-mails that are sent through the STM over an authenticated connection between a
client and an SMTP mail server are not checked for spam.
Note: An e-mail that has been checked for spam by the STM contains an
“X-STM-SMTP” (for SMTP e-mails) or “X-STM-POP3” (for POP-3 e-mails) tag
in its header.
Note: The whitelist takes precedence over the blacklist, which means that if an e-mail
source is on both the blacklist and the whitelist, the e-mail is not scanned by the
anti-spam engines.
- ProSecure Web/Email 1
- Security Threat 1
- Management Appliance 1
- STM150/300/600 1
- Reference Manual 1
- Additional Copyrights 3
- Contents 7
- About This Manual 13
- How to Print This Manual 14
- Revision History 14
- Chapter 1 15
- Introduction 15
- What Can You Do with an STM? 16
- Key Features and Capabilities 17
- 1-4 Introduction 18
- Maintenance and Support 19
- STM Model Comparison 19
- 1-6 Introduction 20
- Figure 1-1 20
- Package Contents 21
- Hardware Features 21
- Front Panel Ports and LEDs 22
- Introduction 1-9 23
- Introduction 1-11 25
- 8) Pair 2 LEDs 26
- Introduction 1-13 27
- Rear Panel Features 28
- Introduction 1-15 29
- Figure 1-6 29
- STM150 Product Label 30
- STM300 Product Label 30
- Introduction 1-17 31
- Figure 1-9 31
- Using the Rack-Mounting Kit 32
- Chapter 2 33
- Your Network 33
- Server Group 34
- Segmented LAN Deployment 35
- Figure 2-3 36
- Logging In to the STM 37
- Figure 2-5 38
- Figure 2-6 39
- Figure 2-9 41
- Figure 2-10 42
- Figure 2-11 43
- Figure 2-12 44
- Figure 2-13 46
- Figure 2-14 49
- Figure 2-15 51
- Figure 2-16 53
- Update Settings 54
- Proxy Settings” on page 3-7 55
- Figure 2-18 56
- Figure 2-19 58
- Verifying Proper Installation 59
- 4. Click Register 61
- What to Do Next 62
- Chapter 3 63
- Figure 3-1 [STM600] 64
- Table 3-1 65
- Figure 3-4 68
- To configure the HTTP proxy: 70
- Figure 3-6 72
- Web Interface Timeout 73
- Figure 3-7 74
- Using an SNMP Manager 75
- Figure 3-8 76
- Table 3-6. SNMP Settings 76
- Supported MIB Browsers 77
- Backup Settings 78
- Restore Settings 79
- Updating the Software 81
- Figure 3-10 82
- Performing a Manual Update 83
- Figure 3-11 84
- Figure 3-12 84
- Figure 3-13 85
- Managing Digital Certificates 87
- Figure 3-15 88
- Managing Trusted Certificates 90
- Figure 3-17 91
- Figure 3-18 92
- Performance Management 93
- Chapter 4 97
- Configuring E-mail Protection 100
- Figure 4-2 102
- Figure 4-3 103
- Figure 4-4 105
- E-mail Content Filtering 107
- Figure 4-5 108
- Table 4-6 109
- Figure 4-6 112
- Figure 4-7 114
- Figure 4-8 116
- Figure 4-9 119
- Configuring Web Malware Scans 120
- Configuring Web URL Filtering 128
- Figure 4-14 129
- HTTPS Scan Settings 132
- Figure 4-16 133
- Figure 4-17) 134
- Specifying Trusted Hosts 135
- Figure 4-18 136
- Configuring FTP Scans 137
- Figure 4-19 138
- Table 4-15. FTP Scan Settings 138
- Setting Scanning Exclusions 143
- Figure 4-24 144
- Exception screen displays 145
- Table 4-17 145
- Chapter 5 151
- Configuring Groups 152
- Figure 5-1 153
- Table 5-1. Group Settings 153
- Editing Groups by Name 154
- Figure 5-3 155
- Configuring User Accounts 156
- Figure 5-4 157
- Table 5-4. User Settings 157
- Editing User Accounts 158
- Configuring Authentication 159
- Figure 5-7 160
- Figure 5-8 160
- Figure 5-9 163
- Figure 5-10 164
- Figure 5-14 166
- Table 5-5. LDAP Settings 167
- Figure 5-15 170
- Table 5-6. RADIUS Settings 170
- Figure 5-16 172
- Global User Settings 174
- Figure 5-18 175
- Figure 5-19 176
- Chapter 6 177
- Figure 6-1 178
- Table 6-3. Syslog Settings 182
- Clearing Logs 183
- Configuring Alerts 184
- Figure 6-5 185
- Table 6-4. Alerts Settings 185
- Web Usage 187
- Information 191
- Monitoring Web Usage 194
- Viewing System Status 195
- Figure 6-10 196
- Querying the Logs 198
- Figure 6-11 200
- Table 6-9. Log Query Settings 201
- Figure 6-12 206
- Figure 6-13 208
- Figure 6-14 211
- Figure 6-15 213
- Figure 6-16 213
- Figure 6-17 214
- Figure 6-18 215
- Figure 6-19 215
- Using Diagnostics Utilities 216
- Statistics Report 219
- Chapter 7 223
- Basic Functioning 224
- LAN or WAN Port LEDs Not On 225
- Figure 7-1 228
- Problems with Date and Time 229
- Using Online Support 230
- Installing Hot Fixes 231
- Figure 7-4 232
- 3. Click Submit 233
- Documentation from the menu 233
- Appendix A 235
- Appendix B 239
- Related Documents 239
- B-2 Related Documents 240
- Numerics 241
- Index-10 250
- Index-11 251
- Index-12 252
- Index-13 253
- Index-14 254
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