I have a linux box hosting a few domains. I would like to set up the server to allow people to check email without being able to login to the system through telnet, ftp, ssh, etc. Can anyone help?
I don't that will restrict ftp, but will restrict telnet or ssh (even better than /dev/null, lots of service accounts have a shell of /bin/false). You need to restrict FTP in another fashion. Check the docs for your ftp server. If you have a lot of mail-only users and few users that are allowed to FTP, you can probably use an allow list instead of a deny list.
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