Re: [exim] verify = recipient/callout --> Exchange2013

[Heiko Schlittermann]

Jeremy Harris <j...@wizmail.org> (Fr 14 Nov 2014 11:29:09 CET):
> On 14/11/14 10:10, Heiko Schlittermann wrote:
> > Currently it seems that they are not able to reject at RCPT, they 
> > reject after DATA: "550 5.1.1 User unknown".
> 
> One has to wonder what the Exchange response to an SMTP session
> with one good, one bad RCPT is.

It just rejects the complete message… It means, if I send a message to a
couple of users, just one non-existing recipient in this list causes a
permanent delivery error for the complete message. More - the sender
sees "User unknown", and does not have any chance to find out about
which user the Exchange server is talking…

I just think of bunch of mailinglist subscribers, all are working in the
same company, thus having the same domain…

One good:

    <-  220 [hidden] Exchange
    -> EHLO nbox
    <-  250-exchange.[hidden].de Hello [10.0.8.2]
    ...
    -> RCPT TO:<peter.[hidden]@foo.[hidden].de>
    <-  250 2.1.5 Recipient OK
    -> DATA
    ...
    -> To: peter.[hidden]@foo.[hidden].de
    ...
    -> .
    <-  250 2.6.0 
<0c526eba-1890-4029-8302-c48c8f7cf...@exchange.ad.[hidden].de> 
[InternalId=1481763717166, Hostname=Exchange.ad.[hidden].de] Queued mail for 
delivery
    -> QUIT

One bad:

    <-  220 [hidden] Exchange
    -> EHLO nbox
    <-  250-exchange.[hidden].de Hello [10.0.8.2]
    ...
    -> RCPT TO:<foo@foo.[hidden].de>
    <-  250 2.1.5 Recipient OK
    -> DATA
    ...
    -> .
    <** 550 5.1.1 User unknown
    -> QUIT


One good and one bad:

    <-  220 [hidden] Exchange
    -> EHLO nbox
    <-  250-exchange.[hidden].de Hello [10.0.8.2]
    ...
    -> RCPT TO:<peter.[hidden]@foo.[hidden].de>
    <-  250 2.1.5 Recipient OK
    -> RCPT TO:<foo@foo.[hidden].de>
    <-  250 2.1.5 Recipient OK
    -> DATA
    ...
    -> .
    <** 550 5.1.1 User unknown
    -> QUIT


    Best regards from Dresden/Germany
    Viele Grüße aus Dresden
    Heiko Schlittermann
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