Dnsrbl Option

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Introduced in release: 8.0.2.1


The dnsrbl MMP option provides a list of domain names used to perform a DNS Realtime Blackhole List check for incoming POP and IMAP connections. The checks are performed in serial and may significantly impact the time it takes for clients to connect to the proxy. When a connection is rejected, a protocol-appropriate access denied error will be provided unless the connection is over SSL and the sslconnlimit option is also set, in which case an SSL user_canceled alert will be sent. If the messagetrace.activate option is set to transactlog, then the rejection will be noted in a co log entry in the store transaction log.


See also: