On 20.10.17 10:21, Emanuel wrote:
Is it possible to create a list where the IP of certain recipients can be blocked?

IPs not, domains yes, use check_recipient_access
http://www.postfix.org/SMTPD_ACCESS_README.html

Our users incorrectly type the domain name of the recipient.

*hotmial.com ==> hotmail.com*

My idea is block the MX or IP ==> mail.h-email.net - 198.133.159.122

unless you know that hotmial.com is an malicious site, don't block it.

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