Re: [exim] syntactically invalid argument(s) - rejected HELO

On Thu, 16 Dec 2004, Igor Robul wrote:

> We have one Vietnamese client who has '_ ' in HELO.

And you're not allowed to point out to them that it violates the
applicable interworking specifications, and is liable to cause them
problems elsewhere?

> Put
> helo_allow_chars = _
> in your exim configuration file.

As a workaround, sure; but breaking a server is no long-term solution
to broken clients.