Switch off SMTP

[Cristian Livadaru]

On 10. Dec 2009, at 17:56 , Jochen May wrote:

>  Hi,
> 
>> This looks to me like your server tried to send a mail but was rejected
>> since you seem to be on a blacklist. If you don't want to let your server
>> send mails you could block port 25 outgoing on your router/firewall.
> 
> Is there any other way to block port 25? 
> I have only a SoHo router and no real firewall. Kolab is running in a xen-domu 
> in a small home office.

Install IPtables, and search for iptables syntax. This could help: http://www.groupsrv.com/linux/about141473.html