[outages] zen.spamhaus.org not resolving

[Jared Geiger]

zen.spamhaus.org
<https://www.dnsbl.info/dnsbl-details.php?dnsbl=zen.spamhaus.org> DNS
blacklist doesn't seem to be resolving. This caused some email to bounce on
a system because it couldn't lookup to see if an IP was on the RBL.
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