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date: Wed, 5 Dec 2007 13:36:04 -0800,    group: microsoft.public.exchange2000.protocols        back       


RE: SMTP authentication not working with POP3 email accounts   
"Jeff Thibodeau [MS]" wrote:

> Hi Darrell,
> 
> From the Exchange server use telnet and open a connection to itself on port 
> 25.  Type EHLO and view the list of verbs.  Makes sure Exchange is 
> advertising the Auth verb.

I am a sysadmin at an ISP, and this is a very common problem for us and we'd 
*really* like to know how to fix it; as you can see, we *are* advertising 
AUTH, and outlook *is* configured for "outgoing server requires 
authentication":

13 10 0.2334 (0.2031)  S>C  application_data
    ---------------------------------------------------------------
    220 vmail01.peak.org ESMTP Postfix
    ---------------------------------------------------------------
13 11 0.2343 (0.0009)  C>S  application_data
    ---------------------------------------------------------------
    EHLO xp
    ---------------------------------------------------------------
13 12 0.2348 (0.0005)  S>C  application_data
    ---------------------------------------------------------------
    250-vmail01.peak.org
    250-PIPELINING
    250-SIZE 10240000
    250-VRFY
    250-ETRN
    250-AUTH PLAIN
    250-ENHANCEDSTATUSCODES
    250-8BITMIME
    250 DSN
    ---------------------------------------------------------------
13 13 0.2372 (0.0023)  C>S  application_data
    ---------------------------------------------------------------
    MAIL FROM: 
    ---------------------------------------------------------------
13 14 0.2381 (0.0008)  S>C  application_data
    ---------------------------------------------------------------
    250 2.1.0 Ok
    ---------------------------------------------------------------
13 15 0.2389 (0.0008)  C>S  application_data
    ---------------------------------------------------------------
    RCPT TO: 
    ---------------------------------------------------------------
13 16 0.2396 (0.0007)  S>C  application_data
    ---------------------------------------------------------------
    554 5.7.1 <cvo-sr1-off.peak.org[69.59.192.10]>: Client host rejected: 
Access denied
    ---------------------------------------------------------------
date: Wed, 5 Dec 2007 13:36:04 -0800   author:   abatie

RE: SMTP authentication not working with POP3 email accounts   
>     250-AUTH PLAIN

After some experimentation, I determined that outlook requires the LOGIN 
auth mechanism; with PLAIN, it just silently doesn't authenticate, even when 
told the server requires it.
date: Wed, 5 Dec 2007 16:08:05 -0800   author:   abatie

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