4. DNS Blacklisting
smtp.proxy may query DNS servers for blacklisting clients and rejecting e-mails based on the result.
4.1 RBL server configuration
The DNS servers to query are configured with the `rbl server' option. This option may be given more than once. Configuring a RBL server turns blacklisting on.
4.2 RBL modes
When at least one RBL server is configured smtp.proxy rejects automatically mails from blacklisted clients. This behaviour can be changed with the rbl-mode option, possible options are
Table 1 - RBL modes
| Value |
Function |
| reject |
reject mail from blacklisted clients, the default. |
| quarantine |
put blacklisted mail into the spam quarantine. |
| log-only |
do blacklist lookups, write the results to syslog but don't reject. |
| delay |
reject blacklisted mails on the client's MAIL command. |
4.3 RBL server-test mode
If rbl-firstmatch is set to no (the default is yes) smtp.proxy queries all configured RBL servers, log all results and forward the mail based on the rbl-logonly setting.
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