--On 14 August 2009 22:59:51 +0100 Alain Williams <addw@???> wrote:
>
>> > Any sort of clustering or load balancing would be done outside of Exim.
>> > high-availability is "built in" to SMTP by the ability to set multiple
>> > MX records, and the ability to retry.
>
> Although you would need some 'high availability' mail store that exim
> could deliver to ...
That's not quite so important. Some MUAs may lose emails when they can't
deliver (especially poorly written web applications, for example). Or, they
might put the mail into a local queue that doesn't get tickled for a long
time - perhaps you're sending last minute instructions to your staff before
you go on leave for a fortnight, for example!
MTAs are vulnerable to DoS attacks, and problems with virus scanners can
bring the host down. Your mailstore (if on a separate host) should be more
stable because it doesn't face those threats. And, the consequence of lack
of availability is less severe - the data should still be there when you
next connect.
--
Ian Eiloart
IT Services, University of Sussex
01273-873148 x3148
For new support requests, see
http://www.sussex.ac.uk/its/help/
