From: Thomas Bridge (thomas.bridge at domain via-net-works.ie)
Date: Tue 15 Feb 2000 - 14:18:47 GMT
Paraic Nolan wrote:
> > - I want qmail to deliver mail direct, (not via our ISP)
> |You might want to reconsider this one. Delivery of an SMTP message to a
> |remote server can take anything from three seconds to two weeks, and
> |general wisdom says that this job should be carried out by a permanently
> |connected SMTP server. Because so many things can go temporarily wrong
> |in delivery, it is definitely faster and more reliable.
> Only if your ISP is reliable.....
If your ISP isn't reliable, get one that is.
> and we are connected most of the time
Irrevelant - it is still a bad idea to deliver direct rather than smart
relay through your ISP's mail servers since you've no guarantees about
the speed of the delivery to the customers host, which means you could
stay on line longer and start earning Eircom's shareholder's increased
dividends :)
Seriously, if you're connecting that much you should probably start
looking at leased line options in any case.
> |Also, since direct-from-dialup is a handy way of avoiding an ISP's spam
> |traps, spammers use it all the time. A decently sized number of mail
> |servers now refuse to accept messages that come straight from a known
> |dialup addresses, since there is no really good reason for a customer
> |not to use the ISP's mail server...
> a) we have a fixed IP
Which doesn't even have a reverse lookup enabled judging by your mail
headers.
> b) Its not nice to make inferences with no information (ie ...)
Noone was making inferences without information - the fact remains that
the vast majority of the spam that I receive comes from machines
connected via a dialup, and it strikes me as a good idea to maybe filter
out mails coming direct from known dialup addresses.
> c) again speed is an issue with bounces and our ISP
It's still faster for you to relay your mail through your ISP's servers
than deliver them direct yourself. And as I said, if your ISP isn't up
to scratch, get another one.
> I think we need to tone down the whole paranoia thing !
About spam?
As a certain Sascha Luck once put it, "the question isn't whether you're
paranoid, but whether you are paranoid enough?"
T.
-- Thomas Bridge 26 Upper Fitzwilliam St., Senior Hostmaster/Sysadmin, Dublin 2, VIA NET.WORKS Ireland. Ph: +353 1 6763600 thomas.bridge at domain via-net-works.ie Fax: +353 1 6627674
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