Re: [exim] Deny crappy HELO

Jethro R Binks wrote:
> On Fri, 9 Jun 2006, Wakko Warner wrote:
>
> > This RE might be better, but i haven't tested it much.
> > ^[^.]+(?:\..*?)?\.[^.]{2,4}$
> ...
> > It does block localhost.localdomain, and any string w/o a dot.
>
> I feel obliged to point out that blocking "localhost.localdomain" does
> cause false positives. I deal with several a year. I guess it is the
> name a system thinks it has in out-of-the-box installs of some
> Unix-alikes, which don't get otherwise properly configured.
>
> In most cases I tell the complaining person to grumble at the system
> operator and briefly explain the problem, copying them in if it is obvious
> how to contact them. I rarely hear back, one way or the other, whether
> the issue gets fixed, and I have only ever had to make one (temporary)
> exception.

I'm not actually using the regexp above on my servers, yet. Since I am the
sole user of the domain I have no problems blocking that. I want to be more
strict on HELO checks, but I do not want to be as strict as verify=helo

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