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How do shared hosting providers block php mail per account?
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How do shared hosting providers block php mail per account?

VitaVita Member

How do shared hosting providers block access to outbound port 25 or other mail ports? I understand by having a dedicated IP, this is a simple iptables rule.

What are the ways of blocking mail php function on systems with shared outgoing IP?

I'm primarily looking for postfix solutions and ideas. I know that postfix has header checks which may be useful but I'm not sure if that is the right way.

My thinking is to block all outgoing mail unless the users linux account is in the whitelist file. Is there a solution for this?

Thanks!

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