Hello, are you sure that your the Cloudron blocklist check works well and that the IP address DB is up to date ?
I'm experiencing the same issue than @laurent with an OVH dedicated server. Cloudron tells me that my server's IP address is on the Spamhaus ZEN block list.
I tested my IP address directly on check.spamhaus.org: IP address "has no issues" !
Then I tested it with mxtools: Green checkmark for Spamhaus ZEN !
Then, again using mail-tester.com: Not listed on any Spamhaus blocklist
(although, mail-tester does not seem to use the ZEN list but shows 4 other Spamhaus list names)
So why does Cloudron tells me that it's on the ZEN blocklist ? Very strange.
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