We are seeing a legitimate domain being rejected by Host Access Table with unknown. The end result the email is aborted. The sender maturity is on at 1 day but domain has been in use for 6 months.
What do I need to set to allow this specific domain through without being blocked?
The external IP is not possible as they are not using a static IP.
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I am assuming from the explanation it is possibly blocked by SDR. You can create a SDR exception by creating a domain name based address list and use it under SDR bypass.
https://www.cisco.com/c/en/us/support/docs/security/email-security-appliance/216192-configure-sender-domain-reputation-for-e.html - Refer to "Domain Exception list" section"
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