Users for ftp only, not telnet

How do i setup users for ftp only?
I need to setup some users to just access my server as ftp, others as telnet and many other just fro e-mail
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to set up a user ftp-only, edit /etc/passwd (you have to be root) and change the login shell (ie. /bin/bash) to something that gives some output and then exits (ie. /bin/date or /bin/false).

for e-mail only, you will have to set up access rights in the ftpaccess configuration file, in order to allow just those, that are in group "ftpusers" to access ftp services (see "man ftpaccess").

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