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Re: No A, no MX... but still retrying.
On Mon, Feb 21, 2000 at 02:01:45PM +0000, Alexey Lobanov wrote:
> It happens that my users mistype addresses like: <user.domain@de>.
> Domain 'de' definitely exists. And definitely receives no mail.
> Instead of immediate rejection, I have normal 2-day retry process
> with TRUE :-) diagnostics:
It should be minimum of 3 days - to allow long weekend.
Two days is a bit -- shortish..
> Nov 16 14:45:07 atrium smtp: smtp; 500 (nameserver data
> inconsistency. No MX, no address: 'de' (NONAME)) r=69
> What should I do to provide immediate rejection in case of existing
> non-mail-capable (no A, no MX) domain?
Yes it should, however I have seen also cases of temporary
DNS failures yielding same result, and I am not very happy
about those :-/
I really should debug that beast someday so we have reliable
diagnostics of that kind -- and not "sendmail like".
(I mean: yielding permanent errors on temporary ones..)
Main problem, I think, is buried deep within getaddrinfo()
library, and sadly if it is faulty, there is very little
hope... (Local copy - fixable - is used only if system
libraries don't have it...)
Open-coding the address resolver beast at smtp.c would
perhaps yield more reliable diagnostic, but it would be
some 300-400 lines of code very least :-/
(And not using /etc/hosts at all, I think..)
/Matti Aarnio <email@example.com>