Block only spam messages at level 3: this option allows defining that beyond the trust threshold of Level 3 (High), the e-mail will be rejected.įor example, if you set a limit of 100 for the heuristic analysis, e-mails with a score higher than 100 will be considered spam.The thresholds are: “1 – Low”, “2 – Medium”, “3 – High”. Block spam messages at level 2 or 3: this option allows defining that beyond the trust threshold of Level 2, an e-mail will be rejected.Block all spam messages (level 1, 2 or 3): the e-mail will be rejected regardless of the level of trust.Tag as spam (in message subject): e-mails will not be blocked but will be tagged as spam.There are 4 possible actions that will allow the SMTP proxy to respond to the remote SMTP server by indicating that the message has been rejected as it is spam :
If mail passes through a server belonging to the trusted domain, the earlier servers will be considered legitimate and the scan will only apply to the following servers. SMTP allows mail relay servers to fill in a field indicating their identity. This value may be defined for mail relayed by internal servers, for example. Mail relayed by a server belonging to the domain indicated will therefore be exempt from the domain scan. This optional field allows defining a “trusted” domain. By filling in this field, which is optional, e-mails will be analyzed more thoroughly by the Antispam module. The trusted server concerns the SMTP server. This option allows examining the contents of the e-mail to determine its impact. This option allows validating the sender by comparing against a public list of known spam senders (DNSBL). Two options are available on the firewall: Enable reputation-based analysis (DNS blacklists - RBL) The antispam module can be enabled by determining the analyses to be enabled.
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