Re: [Exim] AOL - SPF - and EXIM

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著者: Suresh Ramasubramanian
日付:  
To: Exim User's Mailing List
CC: Exim User's Mailing List
題目: Re: [Exim] AOL - SPF - and EXIM
On Fri, Jun 11, 2004 at 10:04:38PM -0400, Greg A. Woods wrote:

> If you reject at RCPT time based on your dislike of the HELO parameter
> then you're only confusing the sender, at best. You're saying at the
> protocol level that you don't like that recipient address then nine
> times out of ten you're going to end up making the sending user think
> they mis-typed the address or that their friend no longer has a mailbox
> at your domain.


Connect from a roadrunner cablemodem to your MX
EHLO yahoo.com

What do you get then?

> I.e. leaving the 5xx to RCPT time instead of sending it at HELO time
> when you should is just plain stupid and violates the _intent_ of the


5xx'ing anywhere other than rcpt to has the unfortunate effect of having a
bunch of broken MTAs that'll treat it as a tempfail and hammer back the
message at you. Microsoft mailservers, virus smtp engines ...

Our error message returns a url like
http://spamblock.outblaze.com/[some-code] - that has a detailed explanation
for those who care to read it. Tends to minimize the confusion part of the
issue I guess.

--
linux@??? (Suresh Ramasubramanian)
jaharkes@ravel:/usr/src$ mv linux Gnu/Linux
mv: cannot move `linux' to `Gnu/Linux': No such file or directory
    jaharkes @ cs.cmu.edu in reply to RMS on linux.kernel