On 28.05.2010, at 02:45, Wietse Venema wrote:

> The pastebin logging does not prove that spam came in on this port 25.

Thanks a lot, that was the hint!

I had recently misconfigured port 587. Now I changed it to:

587       inet  n       -       n       -       -       smtpd -o 
smtpd_client_restrictions=permit_sasl_authenticated,reject

That should be safe...

Jan-Kaspar

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