On Mon, 19 Jan 1998, Philip Hazel wrote:
[Munch]
= >
= > Thus the question: does exim verify sender before relaying mail,
= > or just when delivering it ?
=
= sender_verify applies to all incoming SMTP mail. That looks as if
= moneymakers.com was a valid domain when the mail came into the
= secondary, but when the primary tried to look it up in the DNS, it
= failed (temporarily). There seem to have been an awful lot of DNS
= glitches in the last week or so. Currently it is not available:
=
I am beginning to think that some of this is deliberate: That
some outfit secures a DNS entry, posts a flood of mail, then removes it.
My wish:
A secondary processor on the message log files that would do
things like:
For each domain, track how long it disappeared for. E.g. I
have a lot of users with kinfolk in China. China has such bad networking
that I increased the timeout to 5 days, and the retry to 4 hours. Seems
that a lot of machines are turned off at night. But there are others
that I'm sure are one shot affairs.
With suitable post processing of message log files, you could
determine which sites come and go, and which ones are fly-by-nights.
Then a single added feature, dns_failure_reject=[domainlist]
would allow you to treat certain dnsfailures as permanent failures if
they didn't check out the first time.
Sherwood Botsford | email avatar@???
Sorcerers Apprentice | Office CAB 642B
System Administrator | Tel: 403 492 5728
Trouble shooter | Fax: 403 492 6826
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