Re: [exim4] Testing and making sense of smtp output
On Fri 17 Oct 2014 at 03:20:44 +0200, lee wrote:
> Brian <ad44@cityscape.co.uk> writes:
>
> > Not that I'm suggesting setting up exim to offer an invalid HELO; it
> > will lead to trouble sooner or later. However, as a reason for mail
> > being rejected or not arriving it doesn't come top of the list.
>
> Not accepting invalid HELOs is pretty high on the list because it's a
> very simple check. It gets rid of quite a lot of spam with minimal
> resource usage.
It could also get rid of a lot of legitimate mail because of
misconfigured clients. ISPs get flack doing that so they come
to a decision whether it is worth being so strict. Many ignore
invalid HELOs.
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