A mail transfer agent or MTA (also called a mail server, or a mail exchange server in the context of the Domain Name System) is a computer program or software agent which transfers electronic mail messages from one computer to another. The MTA works behind the scenes, while the user usually interacts with another program, the mail user agent (MUA), which contacts an MTA for actual delivery of the mail.
The delivery of email to a user's mailbox typically takes place via a mail delivery agent (MDA); many MTAs have basic MDA functionality built in, but a dedicated MDA like procmail can provide more sophistication.
BitDefender Security for MailServers uses anti-phishing technology to detect illegal attempts to copy the "look and feel" of authentic messages, as well as the disguises and the forgeries used to persuade the user to send confidential data to a particular recipient.
BitDefender Security for MailServers detects potentially harmful applications, other than viruses, and creates a separate “Riskware”category with which only certain administrator-defined usergroups are allowed to work.
The latest virus signatures are "pushed" to your servers the second they become available instead of waiting for the next scheduled update, further reducing the threat presented by new viruses.
Mailservers already using cbl.abuseat.org should NOT also use xbl.spamhaus.org or you will be making 'double' queries to basically the same data source and only one DNSBL will appear to work (the other(s) will appear to not catch anything).
Mailservers already using dnsbl.njabl.org are advised to continue doing so, as dnsbl.njabl.org is itself a composite list and contains more than the open proxy IPs list part now incorporated in XBL.
Use of the XBL is free for users with normal mailservers (but networks with high email traffic should see DataFeed).
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