Re: [Exim] Two questions on reject log...

On Tue, 29 Oct 2002, Chris Knipe wrote:

> 2002-10-29 07:37:45 rejected HELO from [61.72.146.115]: syntactically
> invalid argument(s): \300\374\305\302\301\370
>
>
> Is this, some kind of DoS attempt? If not, what should be causing this??

That's a Korean IP. They're sending an upper-ASCII string as the HELO.
It's not a DoS. Most likely some Korean open relay.

> Secondly,
>
> 2002-10-28 02:36:19 recipient <SAVAGE@???> refused from
> (om40.yourmailsource.com) [216.177.60.45]
> sender=<NOLIST-1064843966-5933-SAVAGE**SAVAGE*ZA*ORG@???
> > (failed to find host name from IP address)
>
> What causes this?? Failed to find host name from IP Address? Is it missing
> reverse DNS?

Exactly.

$ host 216.177.60.45
Host 45.60.177.216.in-addr.arpa. not found: 3(NXDOMAIN)

Paul