AntiSpam (2)

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RBL lists: This element group represents the "Blacklists". This are lists, that contain servers from which no mails are received. The servers shown in this list tried to send spam mails several times, and therefore are listed in the RBL lists.
Invalid or non_FQDN hostname: By marking this checkbox the identity of the mailserver, that sends mails, will be proven. When a SMTP connection is built up, the sending server sends a "HELO" or "EHLO" command to identify at the destination server. With his command, the server sends its FQDN. If this FQDN is syntactically incorrect, this restriction works with rejecting the mail.
Unknown hostname: By marking this checkbox, it will be proven, if the FQDN of the sending mail server can be dissolved. Gibraltar checks, if a DNS A or a MX entry exists for the senders FQDN. If there is no entry, the mail will be rejected. ATTENTION: If the sending mail server is not configured correctly it is possible that Gibraltar blocks mails that should be forwarded.
SPF check: SPF means Sender Policy Framework. This term describes a method to prevent malpractice of email addresses for sending emails with a counterfeit sender. If an incoming mail has a counterfeit sender, the mail will be rejected. Details about SPF you find under http://spf.pobox.com.
Non_FQDN sender: When you mark this checkbox, it will be proven, if the sender address (MAIL FROM) is a FQDN. If it is not, the mail will be rejected.
Non_FQDN recipient: By marking this checkbox, it will be proven, if the recipients address (RCPT TO) is a FQDN. If it is not, the mail will be rejected.
Unknown sender domain: By marking this checkbox you activate the checking of the senders address for a DNS A or MX entry. If there is no such entry, the mail will be rejected.
Improperly used sender domain: When you mark this checkbox, it will be proved if the sender address or the sender domain respectively is registered in a list of known spam senders. If there is an entry in such a list, the mail will be rejected.
Recipient not verified: By marking this checkbox it will be proven, if the recipient address is attainable. If it is not, the mail will be rejected.

 

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