Webmail + cloudflare and SMTP website

[eris]

RSA_PSS_RSAE_SHA256__AES_256_GCM:256 CV=no: SMTP error from remote mail server after RCPT TO:[email protected]: 550-Rejected because xxxxx is in a black list at zen.spamhaus.org\n550 Error: open resolver; DNSBL Error Code - Open/public resolver - The Spamhaus Project

See:

Spamhaus has gone mad

I haven’t got to the bottom of this yet, but thought I’d post about it in case anyone else is affected. A client running Hestia was complaining about not receiving mail. When I replied asking for more information, my own mail was rejected from his server saying my IP was banned at zen.spamhaus.org. However when I went to check at https://check.spamhaus.org/ its not listed. IP and all associated domain names are clear. I can’t figure out what’s going on. In the meantime, I’ve edited /etc/exim/dn…