Email from POP3 and IMAP email clients that are authenticated by Domino SMTP server task have mail rejected because their connecting host is found in blacklist.
Since some of our clients must use public ISPs to connect, often the ISP is found in the DNS blacklist. The server log shows that the host is looked up first in the blacklist before server authentication succeeds. Is there a way to have authenticated users exempt from being rejected because of their host being found in a blacklist? We cannot turn off the blacklist check because it works so well – 90% of our inbound SMTP connections are blacklisted, but we are willing to allow authenticated users to connect even if their connecting host is blacklisted.
Thanks in advance for a solution.