From: Gary Smith on
> > May 13 04:09:23 host01 postfix/smtpd[10301]: lost connection after RCPT from
> unknown[190.107.112.194]
>
> Listed on SpamHaus XBL
>
> Unless these listings postdate your log entries, you should probably
> not allow these clients to get as far as "DATA".
>
> reject_rbl_client zen.spamhaus.org
>
> provided your traffic load is under the SpamHaus free access limit, and
> your DNS is not slaved to an ISP or other public forwarder that handles
> DNS for many different organizations.

They didn't get as far as data. This was a lost connection before RCPT. The problematic ones where lost connection before DATA though. Anyway, I will be tweaking settings over the weekend while the load is light and I will follow up if it's not resolved.

Thanks,

Gary-