Tom Reed via Postfix-users skrev den 2023-05-23 01:53:
I am not sure why I need a backup mx indeed, but if you make a simple
dig,
you find gmail, fastmail, protonmail, comcast, free.fr those big
providers
do have backup MXs.
Though yahoo, outlook don't have backup MX as a comparison.
one mx can have miltiple hostnames, one domain can have multiple
hostnames/a/aaaa/mx, what is backup mx for you ?
my defination is if over 5 days should be catched on backup mx, then on
recipient need a backup-mx host that have max query lifetime longer then
5 days, else its waste of resources
gmail.com have over 300000 spf ipv4 addresses, not counting ipv6, what
if 300000+ ipv4 is down at the same time should google just use all
there listed ipv6 as backup-mx then ? :)
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