Re: several messages

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Author: Philip Hazel
Date:  
To: Ilya Ketris, Piete Brooks, Nigel Metheringham
CC: exim-users
Old-Topics: Re: Load average based SMTP control
Subject: Re: several messages
On Thu, 12 Sep 1996, Ilya Ketris wrote:

>    Wouldn't it be nice to restrict incoming SMTP
>    connections on the basis of load average, not just
>    maximum connection count?  Number of simultaneous
>    connections often says little about the general load.


Suggestion noted.

On Fri, 13 Sep 1996, Piete Brooks wrote:

> The minimal one (just restrict to N coons) is a 20 line perl script,
> but I am using a sexy one which records the caller info as well,
> instances of calls being rejected, and tailoring based on calling host
> (e.g. I allow 20 calls from within the dept [our MUA doesn't cope well if
> mail isn't accepted] and 5 from outside)
>
> Anyone else interested ?


Piete, I'm prepared to distribute this with Exim if you think that would
be useful.

On Fri, 13 Sep 1996, Nigel Metheringham wrote:

> However this is building everything into exim. Maybe some form of
> general parameter gathering interface could be added...? This might
> enable the whole system portability aspect of load average and disk
> space etc to be side stepped - maybe in a similar way to INN


I think Piete's approach may be the way forward here - don't build
everything into Exim, but have a separate "gateway" that can do any
checks it likes before passing the call on to Exim.

On Fri, 13 Sep 1996, Ilya Ketris wrote:

>    While the whole list looks undoubtedly reasonable, I would give the
>    parameters already present in other mailers special treatment,
>    because people would expect them to be present.


That is certainly a valid point. That is why I noted the suggestion
about load average, and have added it to the Wish List.

--
Philip Hazel                   University Computing Service,
ph10@???             New Museums Site, Cambridge CB2 3QG,
P.Hazel@???          England.  Phone: +44 1223 334714