I would not do that 110 is for POP mail unless of course you want to telnet in to your POP3 account to check mail then telnet domain.com 110. I would not allow Telnet at all on the box bad Idea use ssh. telnet will send all your passwords in clear text.
passwd uses crack to check passwords this is set in the /etc/pam.d/passwd file
looking for something like this:
passwd password requisite /usr/lib/security/pam_cracklib.so retry=3
passwd password required /usr/lib/security/pam_unix.so use_authtok...
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