User manual AIRLIVE ES-4000V2

[. . . ] ES-4000 v2 Email Server Appliance User's Manual 1 Declaration of Conformity OvisLink Corp. 5F. , NO. 6, Lane 130, Min-Chuan Rd. , Hsin-Tien City, Taipei County, Taiwan Email Server Appliance AirLive ES-4000 v2 is in conformity with In accordance with 89/336 EEC-EMC Directive and 1999/5 EC-R & TTE Directive We, Manufacturer/Importer Declare that the product Clause EN 55022:1998/A1 Description Limits and methods of measurement of radio disturbance characteristics of information technology equipmen Disturbances in supply systems caused by household appliances and similar electrical equipment "Harmonics Disturbances in supply systems caused by household appliances and similar electrical equipment "Voltage fluctuations Information Technology equipment-Immunity characteristics-Limit And methods of measurement :2000/A2:2003 EN 61000-3-2:2000/ A1:2001 EN 61000-3-3:1995/ A1:2001 EN 55024:1998/A1 :2001/A2:2003 CE marking Manufacturer/Importer Signature Name Position/ Title Albert Yeh Vice President (Stamp) Date 2007/7/5 AirLive ES-4000 v2 CE Declaration Statement Country cs Cesky [Czech] Declaration OvisLink Corp. tímto prohlasuje, ze tento AirLive ES-4000 v2 je ve shod se základními pozadavky a dalsími píslusnými ustanoveními smrnice 1999/5/ES. Country lt Lietuvi [Lithuanian] Declaration Siuo OvisLink Corp. [. . . ] (Table 5-3) Domain Name host25. airlive. com mail. airlive. com Type A MX IP Address 211. 22. 22. 24 host25. airlive. com Table 5-3 Mapping table of mail eXchanger Under DOS mode, type nslookup -type=MX mail. airlive. com, you will find that mail. airlive. com is mapping to host25. airlive. com (the mail eXchanger) and its IP address 211. "nslookup" is the instruction of locating a DNS server. "mail. airlive. com" is the inquired DNS name. For example, the customer service department of Test company wants to email to mary@mail. airlive. com, a mail server (test. com. tw) served as a SMTP server decides where and how to send the mail by inquiring the target DNS server. The MX record of the inquiry of mail. airlive. com is as followed: (Table 5-4) Domain Name host3. airlive. com mail. airlive. com Type A MX IP Address 61. 11. 11. 10 host3. airlive. com Table 5-4 MX Record of the inquiry of mail. airlive. com 54 Therefore, mail will go to host3. airlive. com according to SMTP Protocol. Reverse: reverse a domain name lookup of its IP address. Domain mapping distinguish into forward mapping and reverse mapping. Forward mapping served as a translator, a translator transforms a letter-pattern address into a figure-pattern address. On the other hand, reverse mapping goes the other way around. Ex. 2: Take Ex. 1 for instance, use nslookup instruction to verify if forward mapping and reverse mapping function normally. C: \>nslookup host1. airlive. com ----------->forward requiring Server: dns. hinet. net Address: 168. 95. 1. 1 Name: host1. airlive. com Address: 61. 11. 11. 12 C: \>nslookup 61. 11. 11. 12 --------------->reverse inquiring Server: dns. hinet. net Address: 168. 95. 1. 1 Name: host1. airlive. com Address: 61. 11. 11. 12 Result shows that 61. 11. 11. 12 is mapping host1. airlive. com 55 5. 4 SPF (Sender policy FrameWork) SPF (Sender Policy Framework) is a type of verification process that is used to prevent fake e-mail addresses by identifying the authenticity of the e-mail sender and filtering out spam. How SPF Works To apply the SPF verification process, two important things must be done to both the sending and receiving end of the e-mail. The DNS server must be added a SPF record at sender end. The Mail server must enable the SPF verification function into order to make SPF working. (Figure 5-2) Figure 5-2 SPF setting For example, suppose someone sends out a spam pretending to be an e-mail from AirLive mail server to your e-mail address. When this spam e-mail is sent to an account with SPF enabled, the account will ask AirLive mail server for the SPF record based on the e-mail's IP address to check if the IP really came from AirLive. If AirLive mail server confirms the SPF verification, then the e-mail will pass the account's SPF verification and be sent to the receiver. On the other hand, if the e-mail does not pass the SPF verification it shall be viewed as junk mail. This means that even if the e-mail is really being sent out from AirLive, yet if AirLive mail server doesn't provide SPF record checking at that time, the e-mail that won't go through the receiver account's SPF verification will still be viewed as junk mail. The SPF checking process needs the sender account to set up SPF record to provide verification checking in order to send and receive normally. It works best when more people use this verification process to completely put the set up to use. The number of corporations that currently have SPF record checking is still quite small, thus under this condition the SPF process at the receiving end that filters out any junk mail will provide the sender with a great deal of inconvenience. 56 5. 5 Example Further Description: DNS directing indicates by which DNS server is managing and in which DNS has detailed domain name information. [. . . ] MDA (Mail Delivery Agent): distributes incoming mails of MTA to local mail accounts according to their account names or sends them to the next MTA. 162 Take sending and receiving mail for example to illustrate the process of mail transmission. When user wants to send a mail: Send mails to MTA via MUA. While composing email with MUA, make sure to follow steps below : 1. Enter the sender email address and outgoing mail server (namely the sender MTA ) 2. Enter the recipient email address and incoming mail server (namely the recipient MTA for receiving mails from external host server) After user finished composing a mail with MUA, such as Outlook Express, mail can deliver to the appointed MTA by clicking on Send. [. . . ]