In recent years, cases of receiving the report of non-delivery of letters.
Basically that's the error:
554 Your access to this mail system has been rejected due to the sending MTA's poor reputation. If you believe that this failure is in error, please contact the intended recipient via alternate means.
Our mail server is not involved in blacklists.
Can you tell me what should i do in this situation?
What settings in C360 can I check and configure?
Thanks in advance.
