@CRBear said in Mail server: IP address verification?:
Am I correct in understanding that the email server checks from which IP address a connection is established to send an email and by default, it verifies against the Spamhaus blacklist?
The mail server does not make any check for outbound email. The various checks you see in the Email Status tab are purely diagnostic. The idea is if one or more checks are failing there, most likely the email won't be delivered.
The Spamhaus is checked for inbound emails though. The DNSBL zone against which it checks is configurable at https://docs.cloudron.io/email/#dnsbl