restore telnet in Mac OSX High Sierra

You can use “nc” to check for (open) ports
This program NetCat is included in Mac OSX High Sierra
Sample:
nc www.server.com 25
if this is not enough you can install telnet from HomeBrew

# install HomeBrew as a regular user (not root)
/usr/bin/ruby -e “$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)”

# get telnet
brew tap theeternalsw0rd/telnet

# install telnet
brew install telnet

#hoppa:
telnet server.com 25

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