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Question advanced configure postfix/qmail

M

m_145

New Pleskian
Server operating system version
CentOS 7.9
Plesk version and microupdate number
Plesk Obsidian Web Host Edition Version 18.0.59
Hello evryone,
I have many server Plesk Obsidian Web Host Edition Version 18.0.59 installed on centos 7 where qmail and postfix are email sending servers I want to know if I can configure a mail server when only the domains names hosted on the machine can send emails, because some time I have many domains not hosted on the server sending emails using the ip address server.
 
How is that possible that domains which are not hosted on your server are able to sent email via your server? How do you know that's even the case?
 
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