Block sending and receiving of all emails not on the Atmail server – atmail help centre

PROBLEM

Our need is to block all email addresses/domain not configured in the Atmail server.

ENVIRONMENT

On-Premise Server + WebMail Installations: Version 6.0 > Current Version

CAUSE

So I want to avoid mail deliveries from addresses like bill.gates@microsoft.com or george.bush@whitehouse.org.

RESOLUTION

Open and edit the Exim configuration file located at /usr/local/atmail/mailserver/configure, please remember to also back up this file before changes are made. Find and delete the following code.

# This router routes addresses that are not in local domains by doing a DNS
# lookup on the domain name.
dnslookup:
driver = dnslookup
domains = ! +local_domains
transport = remote_smtp
ignore_target_hosts = 0.0.0.0 : 127.0.0.0/8
no_more

Restart the Atmail server and test.

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