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11.5 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.
1. The DNS server must be added a SPF record at sender end.
2. The Mail server must enable the SPF verification function into order to make SPF working. (Figure 11-5)
Figure 11-5 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.
Summary of Contents for ES-6000
Page 1: ...ES 6000 Email Server Appliance User s Manual ...
Page 53: ...52 Figure 4 46 Adding a Contact Figure 4 47 New Contact Added ...
Page 57: ...56 Figure 4 52 Create new Internet Account Figure 4 53 Define LDAP server IP address ...
Page 60: ...59 Figure 4 58 Configure LDAP server Advanced setting ...
Page 72: ...71 Step3 Web based mail for easy mail access Figure 5 5 Figure 5 5 Web Mail Interface ...
Page 74: ...73 Figure 5 9 Editing Personal Information ...
Page 77: ...76 Figure 5 13 Selecting the Desired Fields to Export Figure 5 14 Export Process Completed ...
Page 79: ...78 Figure 5 17 Clicking into Import Screen Figure 5 18 Address Book Successfully Imported ...
Page 81: ...80 Figure 5 20 Uploading a File to ES 6000 s Built in Web Disk Figure 5 21 File Uploaded ...
Page 96: ...95 Figure 6 12 Check all mails to retrieve Figure 6 13 Check all mails to resend ...
Page 127: ...126 Figure 6 56 Selecting Spam E Mails Figure 6 57 Forwarding Spam E Mails as Attachment ...
Page 134: ...133 Figure 6 65 Receive the periodic report ...
Page 135: ...134 Figure 6 66 The first page in periodic report ...
Page 136: ...135 Figure 6 67 The second page in periodic report ...
Page 137: ...136 Figure 6 68 The third page in periodic report ...
Page 138: ...137 Figure 6 69 The fourth page in periodic report ...
Page 139: ...138 Figure 6 70 The history report setting Figure 6 71 Receive the history report ...
Page 140: ...139 Figure 6 72 The first page in history report ...
Page 141: ...140 Figure 6 73 The second page in history report ...
Page 142: ...141 Figure 6 74 The third page in history report ...
Page 170: ...169 Figure 8 13 An E Mails Shown on a Smartphone Figure 8 14 Reading an E Mail ...
Page 179: ...178 Figure 9 4 The setting of backup immediately ...
Page 208: ...207 Figure 12 14 Adding a New Folder Figure 12 15 The Related Settings of a Folder ...
Page 209: ...208 Figure 12 16 Opening a Folder Figure 12 17 Uploading a File ...
Page 212: ...211 Figure 12 23 Downloading the Desirable File ...
Page 215: ...214 Figure 14 1 Display system info ...
Page 217: ...216 Figure 14 3 Search results ...
Page 218: ...217 Figure 14 4 Event log details ...