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Hello,

We're experiencing problems with lots of recipients (not hosted by us) because of an RBL Error.

The rebound states the following:
SMTP error from remote mail server after RCPT TO:<[email protected]>:
550-"JunkMail rejected OURSERVERDOMAIN[OUR-IP-ADDRESS]:33842 is in
550 an RBL: Error: open resolver; https://www.spamhaus.org/retuc/pub/2400:cb00:44:1024::c629:e564"

When you look at this webpage...

Email delivery problem with SpamHaus