Basically, the code connects to the remote server and checks to see if the template log.ntf can be found and it has a valid replica ID. If the template can be found and has a valid replica ID, then the server is up. Otherwise, assume the server is down. Our testing of this function amounted to running it as a scheduled agent with the remote server up and after we shut the remote server down.
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Lotus Notes Domino mail server have many way to setup system, try guide below for set feature prevent spam mail.
Server Level Control Of Mail (this is just an overview, the Redbook covers this topic in much greater detail)
1. DNS Blacklist (DNSBL) Filters:
- Enforcement options: Log only, Log and tag message, Log and reject message
- Custom error response for rejected messages
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When Lotus Domino DNS blacklist filters are enabled on a Domino server, every incoming SMTP mail connection is checked against one or more DNSBLs. Domino performs a DNS query against the blacklists at the DNSBL sites specified. If a connecting SMTP mail host is found on the blacklist, Domino can do any of the following:
* Log the message
* Log and tag the message
* Log and reject the message
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Specifying the DNS blacklist sites to check
You can specify one or more sites that the Domino server’s SMTP task will use to identify whether a connecting host is a “known” open mail relay or spam source. You must specify sites that support IP-based DNS blacklist queries.
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DNS blacklist filters overview
DNS blacklist filters are a new and powerful feature in Domino 6 and one of the more effective weapons against spam. With the DNS blacklist filters enabled, Domino will check inbound mail to see whether it originates from a mail server that is listed in one or more DNS blacklists (DNSBLs).
DNSBLs are databases that keep records of Internet SMTP mail hosts that are known sources of spam or permit open mail relaying. DNSBLs are maintained by many sources, both free and fee-based, and their effectiveness varies, so you may need to experiment with different DNSBLs to see how effective they are in your environment.
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