Experiencing delivery failed with email routing
Hello, I'm having trouble with email routing. I always get a Delivery Failed result, and the Rejected reason is [Unknown error: permanent error (554): 5.7.1 rejected by rspamd filter] for destination addresses of protonmail.com, and [Unknown error: permanent error (550): 5.7.1 Service unavailable, Helo domain is listed in Spamhaus] for outlook.com, could anyone please help me?
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