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POP/IMAP before SMTP
Has anyone implemented POP/IMAP before IMAP with ZMailer smtpserver using the
policy filtering? How it works: everytime someone successfully enters a
correct userid/passwd to POP/IMAP server, the IP address of remote client
is logged in a .db file together with a timestamp. The database will then
serve as a list of IP addresses that are allowed to perform an SMTP relay by
the smtpserver. A background process is used to expire addresses from
the database as their validity runs out, say 15mins.
Will it possible for smtpserver to reread smtp-policy database file without
any racing problem for frequent modification, say per 30 second?
Is anyone actual implementing such for avoid anonymous mail submission?
Lai Yiu Fai | Tel.: (852) 2358-6202
Centre of Computing Services | Fax.: (852) 2358-0967
& Telecommunications | E-mail: firstname.lastname@example.org
The Hong Kong University of | Clear Water Bay,
Science & Technology | Kowloon, Hong Kong.