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About spam mail prevention of Nirai
Our company recognizes the spam mail to the ordinary Internet user that is not only harmful but also negatively affects healthy development of the Internet. Prevention are positively done by the following methods, and we ask the customer to cooperate with the understanding. We will execute the spam mail prevention on June 1, 2006.
What is a large amount of Mail Sending control?
When it is confirmed that a large amount of mail transmitted via our transmission server of as part of the spam mail, The spam mail control system will temporarily restrict the transmission of the sender person. In that case, the restriction will be removed until decreasing the number of mail transmission after hours. Moreover, we recommend the customer those who use another account with the another domain excluding nirai.ne.jp might send a large amount of the mail to change transmission server from nirai to another domain transmission server.
Please apply from the following receipt form when you use another externaldomain mail transmission server.
To prevent the delay and the reception refusal of normal mail on the Internet by the adverse effect and the spam mail by no intention of an infected customer with a large amount of sending unsolicited bulk mail messages entrepreneur, the spyware, and the virus, etc. , and the transmissions of a large amount of spam mail in a short term, these measures restrict to the user who transmits a large amount of.
Sending and receiving refusal because of fake domain name.
In the spam mail, there is mail that an infected PC with the spyware and the virus pretends those who transmitted. In the Nirai mail server of, because the password is never demanded in Mail Sending, those who transmit mail by using the address of fictitious that combines others' addresses and random characters and makes it. Because it deals with this problem. in the Nirai mail server is set that sending and receiving refusal when transmission person's mail address is a fictitious domain name.
The reception refusal of mail from IP address not to be able to confirm the host name.
Incoming from SMTP server that uncertained host and domain name is limited as a spam prevention so as not to receive mail. As the one example in the HELO command in SMTP session, the reception is refused when there is no answer in FQDN (host + domain name). Because the most of normal mail is sent via the provider and the mail server of the belonging official domain, but many of spam mail transmission by illegal traders, programs and viruses is sent via the fake mail server. Many of spam mails will be stopped by those methods.
Outbound Port25 Blocking for transmitting. to Nirai user.
The method of Outbound Port25 Blocking is effective for the PC that high-jacked by spam transmission program. Because many of spam mail transmission by illegal traders, programs and viruses is sent via the fake external mail server. In a word, the feature of spam mail is not to via the mail server for the transmission of the belonging official domain. Concretely, we block the communication to SMTP ports (Port25) of other external mail server. It only open to Nirai mail server. Those who will be undertaken this limitation by using our access line through to another external mail server.
This limitation can be evaded by changing the setting of your e-mail software. See this figure for changing.
ex) It changes to 'smtp.nirai.ne.jp' for 'smtp.xxx.com'.
Please apply from the following homepage receipt form when you still want to use another external mail server without changing your e-mail software setup.
How to prevent the spam mail by yourself
Use the filter function of the e-mail software.
In various e-mail softwares, the function that can be automatically distributed to the folder based on the content of the received mail. So that the spam mail can be moved to another folder, be deleted from the server automatically by using the filter function, and it put it in the garbage box. Please refer to the Web page that introduces the method of setting the filter function of an e-mail software general.
Changing mail address.
Once your mail address is registered on the target list by the spammer, they are keeping to send unsolicited bulk mail messages. You can change your mail address by yourself through the following procedure
Use the function of the security software.
Also in anti-virus/security software, there is something in which the function that can be used for the spam mail measures is equipped. It is one of the measures to use the function of such software.
