Method for filtering spam e-mails
An e-mail and mail technology, applied in the field of e-mail, can solve the problems of reducing user quality and inability to filter spam, and achieve the effect of improving quality and efficiency
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[0023] Step 1, the mail receiving server receives the email, judges whether the server IP address, MX record and TXT record of the mail are legal, if legal, saves the server IP address, MX record and TXT record, and enters step 2; otherwise discards the mail;
[0024] The condition for judging whether the email is legitimate is: by querying the DNS server,
[0025] 1) Determine whether the email domain name corresponds to an IP address;
[0026] 2) Determine whether the email domain name has a matching MX record;
[0027] 3) Determine whether the TXT record of the email domain name exists;
[0028] 4) The IP address obtained by analyzing the email domain name is then reversely analyzed by PTR to determine whether it is consistent with the domain name of the email sending server;
[0029] If the above conditions are met, it is judged as a legitimate email, and enter step 2;
[0030] In step 1, the trust degree policy is also added:
[0031] 1) Form a record information data...
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