Telnet - SSH2 for Mac OS X. Download a Free Trial. Gives easy Linux/UNIX server access.
PuTTY's raw connection type is just a way of making a raw TCP connection. You can use telnet or nc to achieve the same thing in Terminal: will@Darwin:~> nc relay.plus.net 25 220 relay.plus.net ESMTP Exim Tue, 04 Aug 2009 00:02:08 +0100 helo 250 pih-relay08.plus.net Hello [1.2.3.4] quit 221 pih-relay08.plus.net closing connection will@Darwin:~> telnet relay.plus.net 25 Trying 212.159.8.107... Connected to relay.plus.net. Escape character is '^]'. 220 relay.plus.net ESMTP Exim Tue, 04 Aug 2009 00:03:10 +0100 helo 250 pih-relay08.plus.net Hello [1.2.3.4] quit 221 pih-relay08.plus.net closing connection Connection closed by foreign host.
Download Telnet Lite for macOS 10.9 or later and enjoy it on your Mac. Mocha Telnet provides access to a Linux/UNIX Telnet Server. You can connect to a Telnet Server and run applications in a VT220 Terminal window.
One more simple and easy way to get telnet on your new Mac is by using backup. This will happen when you already have the old Mac that has telnet. So, what you need to do is just copy telnet from the old one to the new one.