Restricting who can send Internet mail to your users
Unsolicited commercial e-mail (UCE) can flood your server with numerous copies of the same message. Accepting UCE reduces performance and consumes system resources. You can specify restrictions to prevent UCE from being routed to or relayed through your server. Specifying restrictions prevents malicious users from using your system to spoof addresses or send UCE.
About this task
To save system resources, before it accepts a message, the Domino® SMTP listener checks the Mail From address specified in the message envelope during the SMTP transaction. If you set the Domino server to deny mail from a particular source, Domino denies it whenever that source is encountered -- for example, if users from a denied domain send mail through a relay, Domino denies it based on its origin from that domain. Domino creates an entry in the log file (LOG.NSF) whenever a message is rejected.