Micah Abrams wrote:
>
>
> On 3/22/08 8:24 AM, "Eric Shubert" <[EMAIL PROTECTED]> wrote:
>
>> Micah Abrams wrote:
>>> List -
>>>
>>> I have been getting sporadic reports from users that people attempting
>>> to send them msgs are receiving a bounce with following error:
>>>
>>> 511 sorry, no mailbox here by
>>> that name (#5.1.1 - chkuser)>
>>>
>>> The users identified in the bounce msg definitely exist on the server
>>> (no mis-spellings etc..) and these users are receiving mail otherwise.
>>> I have checked the smtp logs and they report Œfound existing recipient¹
>>> when the msg arrives. This particular server is also very low volume.
>>> Any help/ideas would be much appreciated. This is a new install using
>>> qmail-toaster-1.03-1.3.15.
>>>
>>> Thanks,
>>>
>>> Micah
>> Does the send log give a clue?
>
> Thanks for the quick response. Unfortunately, there is nothing in the send
> log for these msgs at that time... Also, on this particular msg (although I
> don't think its always the case) the original sender sent the msg to 3
> recipients on this server one of which was really did not exist. However
> the bounce says that all 3 users do not exist (separate chkuser line in the
> bounce for each user).
>
> Micah
>
I think you just explained what's happening.
Mail servers handle multiple recipients to the same domain in different
ways. For instance, qmail sends each message separately, which ensures that
deliverable copies are delivered, at the expense of bandwidth. Some other
servers (I don't know which ones off hand), in order to preserve bandwidth,
send a single copy to all recipients in the same domain. When such a message
arrives qmail splits it out to each recipient, but only after the message
has been accepted (qmail cannot split it out beforehand). Since there's an
invalid address in the message, qmail cannot receive it, and must bounce the
entire message. It wouldn't be possible to deliver the valid ones and bounce
just the invalid ones. That's why qmail does things the way it does - 1
recipient per message. When a mail server sends a message with multiple
recipients, this is what happens. It's 'normal' (albeit undesirable)
behavior of some mail servers. In addition, it's practically impossible for
the user to distinguish which address was invalid in this scenario.
Any way to find out which MTA the sending server is running? (just curious)
HTH
--
-Eric 'shubes'
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