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CS-2000 UTM Content Security Gateway User’s Manual
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3. MX
The MX can precede the mail transfer by the DNS search. If user want to change the mail server, then he
only need to modify the DNS record, in other words, the destination mail server has no need to know which
mail server that the user used to transfer mails.
Example 3：
The MX represents the mail exchange; it is a kind of DNS record used to provide the e-mail
service.
Host Name Type Address
host25.test.net.tw A 211.22.22.24
mail.test.net.tw MX host25.test.net.tw
The MX mapped relations
If we type nslookup -type=MX mail.test.net.tw in DOS.（The nslookup is the DNS search command, and the
strings after -type represents the DNS record. The mail.test.net.tw is the searched DNS host name which
mapped to the host25.test.net.tw mail exchange and it also mapped to the IP address of 211.22.22.24.
We assume that test Customer Service Center sends the e-mail to [email protected]
.
The Customer Service people send the mails through the test.com.tw (SMTP Server), and
the SMTP Server will ask mail.test.net.tw of which way to send mails via the DNS search.
The way to search the MX record in mail .test.net.tw.：
Host Name Type Address
host3.test.net.tw A 61.11.11.10
mail.test.net.tw MX host3.test.net.tw
The way to search the MX record in mail.test.net.tw
The m a il ser ver of m a il. t e st.ne t.tw w ill sen d e-mai ls to t he addre ss of host3.test.net.tw via
SMTP Protocol.
- CS-2000 1
- Table of Contents 4
- Chapter 1: Introduction 7
- 1.2 Package Contents 9
- 1.3 CS-2000 Front View 9
- 1.4 Specification 10
- Chapter 2: Installation 12
- 2.3 Login 13
- 2.4 Application 14
- Deployment 15
- Chapter 3: System 17
- Administrator 18
- 3.1.1 Admin 19
- 3.1.2 Permitted IPs 21
- 3.2 Configure 23
- Date / Time: 24
- Multiple Subnet: 24
- Dynamic DNS 26
- Host Table 26
- 3.2.1 Setting 27
- Exporting CS-2000 settings 27
- Importing CS-2000 settings 28
- Dynamic Routing (RIPv2) 31
- SIP protocol pass-through 32
- To-Appliance Packets Log 32
- System Reboot 32
- 3.2.2 Date/Time 33
- 3.2.3 Multiple Subnet 34
- Exercise Preparations 34
- 3.2.4 Route Table 37
- Preparations 37
- 3.2.5 DHCP 41
- 3.2.6 DDNS 43
- 3.2.7 Host Table 45
- 3.2.8 SNMP 46
- 3.2.9 Language 48
- 3.3 Logout 49
- Chapter 4: Interface 50
- 4.1 LAN 52
- 4.2 WAN 53
- 4.3 DMZ 58
- Chapter 5: Policy Object 60
- Definition 61
- 5.2 Service 70
- Service 71
- 5.3 Schedule 79
- Example 80
- 5.4 QoS 81
- Authentication 85
- Authentication： 86
- POP3 server authentication) 108
- 5.6 Content Blocking 125
- Content Blocking： 126
- Example 1. URL 128
- Example 2. Script 131
- Example 3. Download Blocking 133
- Example 4. Upload Blocking 135
- 5.7 IM/P2P Blocking 137
- Setting 138
- We set two examples: 139
- Example 1. IM Blocking 140
- Example 2. P2P Blocking 142
- 5.8 Virtual Server 144
- Virtual Server 145
- Example 1 147
- Example 2 150
- Example 3 152
- Example 4 155
- 5.9 VPN 158
- 5.9.1 VPN Wizard 161
- 5.9.2 Example 1 168
- 5.9.3 Example 2 183
- 5.9.4 Example 3 229
- 5.9.5 Example 4 243
- 5.9.6 Example 5 263
- Chapter 6: Policy 276
- Example 5 297
- Example 6 300
- Chapter 7: Mail Security 304
- 7.1.1 Setting 305
- 7.1.2 Mail Relay 309
- 7.1.3 Mail Account 315
- 7.1.4 Mail Notice 324
- 7.2 Anti-Spam 337
- 7.2.1 Setting 338
- 7.2.2 Personal Rule 342
- 7.2.3 Global Rule 343
- 7.2.4 Whitelist 345
- 7.2.5 Blacklist 345
- 7.2.6 Training 346
- 7.2.7 Spam Mail 347
- Mail Transferring Process： 350
- 7.2.9 Anti-Spam Examples 353
- 7.3 Anti-Virus 400
- 7.3.1 Setting 401
- 7.3.2 Virus Mail 404
- 7.3.3 Anti-Virus Examples 406
- 7.4 Mail Report 417
- 7.4.1 Setting 418
- 7.4.2 Statistics 424
- 7.4.3 Log 426
- Chapter 8: IDP 430
- 8.2 Signature 435
- 8.2.1 Anomaly 436
- 8.2.2 Pre-defined 437
- 8.3 IDP Report 444
- 8.3.1 Setting 445
- 8.3.2 Statistics 450
- 8.3.3 Log 452
- Chapter 9: Anomaly Flow IP 456
- Chapter 10: Web VPN/SSL VPN 461
- The VPN terms 462
- Chapter 11: Advance 471
- Inbound Balance 472
- 11.2 High Availability 511
- Use restriction: 520
- Chapter 12: Monitor 521
- Traffic 523
- Connection 526
- 12.1.1 Log Examples 527
- Example 1. Traffic 528
- Example 2. Event 532
- Example 3. Connection 533
- Example 4. Log 535
- 12.2 Accounting Report 536
- Outbound Accounting Report 537
- Inbound Accounting Report 538
- Example 1. Outbound 539
- Example 2. Inbound 544
- 12.3 Statistics 549
- Statistics 550
- Example 1. WAN 551
- Example 2. Policy 553
- 12.4 Diagnostic 555
- Example 1. Ping 556
- Example 2. Traceroute 559
- 12.5 Wake on Lan 561
- 12.6 Status 563
- 12.6.1 Interface 564
- 12.6.2 System Info 566
- 12.6.3 Authentication 568
- 12.6.4 ARP Table 569
- 12.6.5 Sessions Info 570
- Sessions Info 572
- 12.6.6 DHCP 573
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