Tim Korves wrote:
Hi,

You can either have your users use port 587 for
sending emails, or stop using zen.spamhaus.org in your blacklist. The
zen.spamhaus.org list blocks all dynamic IP addresses (cable modems,
DSL, dial-up, etc.).

so which blacklist-host can we use now, if we don't want to block dynamic IPs 
on 25?

That's a decision that really has to be made by you. It's different for everyone, and it's even different between servers that I run depending on clients.
Here's what I used for the majority of them:
-r cbl.abuseat.org -r list.dsbl.org

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