It appears that Odhiambo Washington via mailop <odhia...@gmail.com> said:
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>Today morning I woke up to all emails being rejected as I was using
>zen.spamhaus.org in my dnslists.
>Almost all incoming emails - even from gmail.com - were being rejected.
>Did I maybe miss something?

Are you using a public DNS resolver like 1.1.1.1 or 8.8.8.8?  DNSBLs like
Spamhaus don't work with them.  You have to use your own resolver or at
least one your own network runs.

R's,
John
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