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
nc 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”

# get telnet
brew tap theeternalsw0rd/telnet

# install telnet
brew install telnet

telnet 25

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