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- POPauthd is a Perl-based daemon that uses POP to authorize connecting hosts for SMTP relaying. It is particularly useful to authenticate roaming users with IP addresses that change often. The daemon runs in the background, watching the syslog for successful POP logins. When it sees one, it enters the IP in sendmail's access database, giving the host authorization to relay through the server. The entries can be expired after a prescribed, configurable period of time with a companion script run via crontab. 'POPauthd' is designed to run on a FreeBSD server, but should work properly on any UNIX system. It will work with any POP3 daemon that's capable of writing successful POP logins to a log file.
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