qmail-spp

Bloccare gli HELO/EHLO con falso DNS

La Sezione 3.5 del documento RFC-821 afferma che The sender-SMTP MUST ensure that the <domain> parameter in a HELO command is a valid principal host domain name for the client host. As a result, the receiver-SMTP will not have to perform MX...

Greylisting per qmail

Greylisting is a method of defending e-mail users against spam. A mail transfer agent (MTA) using greylisting will "temporarily reject" any email from a sender it does not recognize. If the mail is legitimate, the originating server will try again after...