Re: Re: chkuser - rejects legit mail, when followed by bad e-mail

Quoting "Matt Brookings" <[email protected]>:

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> On 10/08/2010 11:05 AM, Eric Shubert wrote:
>> U. George wrote:
>>> It is not clear to me if the same message is sent to multiple users,
>>> or multiple messages to multiple users using the same smtp session.
>>
>> I don't recall ever seeing multiple messages using the same smtp
>> session. I presume it can be done simply by following the . (ending one
>> message) with another "MAIL FROM" command and proceeding with another
>> message. I just haven't ever (in 4 years of using QMT) seen it in a log.
>>
>>> BUT, I think, if the *last* email rcpt is legit, then the message is
>>> passed along to that legit account irrespective of any any failures
>>> that happened before. I will have to review the mail log to see if
>>> thats true.
>>
>> That shouldn't be happening. If any one of the recipients is invalid,
>> the message should be rejected (depending on the bounce/catchall setting
>> of course). Someone please correct me if I'm wrong on this.
>>
>>> I will have to log the smtpd session to see what the actual conditions
>>> are.
>>
>> Please let us know what you determine. Inquiring minds want to know. ;)
>
> A receiving SMTP server that is doing recipient validation for a
> single message has no reason to reject an entire message simply
> because a single RCPT command failed.  If there are three RCPT
> commands, two fail, one succeeds, and the sending server continues
> sending, the single recipient that was accepted will receive the message.
>
> The sending server may choose to handle the RCPT failure however it
> wants, but a receiving server should not reject a DATA command unless
> there are no recipients to deliver to (or other protocol errors).

There was actually a 'bug' in an older chkuser that did the exact same  
thing with Hotmail.  If you received an email from Hotmail, with two  
recipients and one was invalid, the error code chkuser spat out was  
interpreted literally by Hotmail as a full failure and not a user  
failure and Hotmail would bounce the entire message to the sender.

http://mail.tnpi.net/toaster/?0::11467

I debugged the whole thing only to have Tonix wake up in Italy and say  
'yeah, upgrade to the latest version' :)

What version of chkuser are you running?

Rick


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