White list. Technical details (ISPmanager)

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A white list is currently supported by Postfix, Sendmail and Exim mail servers. It is based on the content of /etc/mail/access, or /usr/local/etc/exim/whitelist (/etc/exim4/whitelist) if Exim is used. Following are the records from this file:

Postfix и Sendmail 

127.0.0.1 OK
domain.com OK
info@domain.com RELAY
1.2.3 RELAY

The OK records allow sending email to local mailboxes, RELAY allows sending to both local mailboxes and external mail servers.

Exim

A list of IP-addresses, domain names and mailboxes one per line.

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