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While executing

sudo dpkg-reconfigure exim4-config

there is this screen (IP adresses on which exim shall listen): enter image description here

What does the ::1 mean? Is it an exim specific thing or - as I assume - some genereal linxu thing?

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up vote 4 down vote accepted

::1 is an IPv6 address for localhost. Numerically, the address is just 1.

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