Re: [Exim] Exim 4.34 Server: synchronization errors

Johann Spies <jspies@???> wrote:
> On Thu, Jul 22, 2004 at 01:46:16PM +0200, Daniel Tiefnig wrote:
>> Ephraim Silverberg wrote:
>>> telnet mailhost.cs.huji.ac.il 25
>>>
>>> It takes several minutes to respond and in the meantime the Exim
>>> 4.34 server logs the following:
>> [...]
>>> 3. DNS lookup (and reverse lookup) of the laptop on the Exim servers
>>> gives an immediate (and correct) response.
>>>
>>> Any ideas?
>>
>> Ident?
>> Try setting
>> rfc1413_query_timeout = 0s
>> in exim main configuration. Or set rfc1413_hosts to empty string.
>
> I also get this "synchronization error (input sent without waiting for
> +greeting)" often in my mailing logs. After reading your mail I have
> changed the rfc1413_query_timeout to 0s but I still get one very
> minute or two in the logs (on a server that handles about 30000 emails
> per day and rejects about 12000 emails (viruses, spam and bounces)).
> Is it just a case of mail servers not using the correct protocol or is
> it something I can (should) correct on my side?

There are several variations of this error, which I often see after my rcpt
or data ACLs have done a 'deny'. Caused by spamware not properly obeying
protocol rules. Safe to ignore them, unless you see a pattern relating to
hosts which are sending genuine mail.

Peter