We have a DL that has 5000+ users and we get these errors all the time, we were supposed to consolidate but never got around to it. This will cause some latency but never seen it where it would stall the queue like you mentioned. Some of our EX\DCs are high performance and some are terrible. But I would do what James has suggested, try to consolidate the group by nesting so we can at least eliminate this as a factor. When you rebooted (if you did both EX and DC) did the queue start clearing at all? Also how many GCs do you have? The only other time I've seen it where the queue would get stuck in the categorizer with no other events was due to misconfigured sites and services. We had an EX server querying a DC our in a remote site over slow link on slow server. The EX server would queue the message for up to an hour than go down by itself. If you have multiple GC's, you can try manually setting different GCs for dsaccess if you suspect a particular dc is having some issues. ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx on behalf of James Lilly Sent: Wed 3/29/2006 4:47 PM To: exchangelist@xxxxxxxxxxxxx; tpkern@xxxxxxxxx Subject: [ExchangeList] Re: message stuck in categorizer Hey, have you seen this link? http://www.eventid.net/display.asp?eventid=2074&eventno=4451&source=MSExchangeDSAccess&phase=1 I have also read for other versions of Exchange, that 3000 is the recommended maximum for a single DL. Are you in an environment where you could change the group to be nested, and use two (or more) smaller groups to make up the DL? (Yeah, yeah, I know, it's a group, but same ol' same ol'.) Also, check out this KB article, specifically the LDAP paramenter for MaxValRange. I'm guessing that opnyc10.opandco.com is set to something less than 3000. :) http://support.microsoft.com/default.aspx?scid=kb;en-us;315071 Hope this helps; James ________________________________ From: tpkern@xxxxxxxxx [mailto:exchangelist@xxxxxxxxxxxxx] Sent: Wednesday, March 29, 2006 3:11 PM To: <exchangelist@xxxxxxxxxxxxx> Subject: [ExchangeList] Re: message stuck in categorizer I get 2 dsaccess errors- Event Type: Warning Event Source: MSExchangeDSAccess Event Category: LDAP Event ID: 2074 Date: 3/29/2006 Time: 2:23:10 PM User: N/A Computer: EXNYC04 Description: Process STORE.EXE (PID=2400). A search or read to Directory Server opnyc10.opandco.com returned object 'CN=DL - ALL USERS,OU=OPCO,OU=GROUPMAILBOXES,DC=OPANDCO,DC=COM' which has attribute 'member' with too many values to return in a single search. If possible, reduce the number of values in this attribute to allow normal operation. For more information, click http://www.microsoft.com/contentredirect.asp. AND- Event Type: Error Event Source: MSExchangeDSAccess Event Category: LDAP Event ID: 2061 Date: 3/29/2006 Time: 2:23:10 PM User: N/A Computer: EXNYC04 Description: Process STORE.EXE (PID=2400). An LDAP search call failed - Server= opnyc10.opandco.com Error code=80040904. Base DN=CN=DL - ALL USERS,OU=OPCO,OU=GROUPMAILBOXES,DC=OPANDCO,DC=COM, Filter=(objectclass=*), Scope=0. For more information, click http://www.microsoft.com/contentredirect.asp. Thanks On 3/29/06, ChongJa@xxxxxxxxxxxxxxxx <ChongJa@xxxxxxxxxxxxxxxx > wrote: No events? I would've expected some dsaccess events. Did you turn up diag for dsaccess? Take a look at this article to help troubleshoot. Verify that your EX can connect to your ldap and GC ports of your DC. http://searchexchange.techtarget.com/originalContent/0,289142,sid43_gci1119795,00.html ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx on behalf of Todd Hofert Sent: Wed 3/29/2006 11:17 AM To: exchangelist@xxxxxxxxxxxxx Subject: [ExchangeList] Re: message stuck in categorizer I have some concrete shoes for the user. ________________________________ From: exchangelist-bounce@xxxxxxxxxxxxx [mailto:exchangelist-bounce@xxxxxxxxxxxxx] On Behalf Of Tom Kern Sent: Wednesday, March 29, 2006 11:14 AM To: ExchangeList Subject: [ExchangeList] message stuck in categorizer I have a user who sent an email to almost 3000 recipents internally and the email is stuck in the"messages awaiting directory lookup" queue for almost 4hrs now. There is nothing logged in the app log on the exchange server(i turned up diag logging). There is nothjing on the GC log. Load is fine. Can anyone help me with this? Thanks This e-mail and any attachments may contain confidential and privileged information. If you are not the intended recipient, please notify the sender immediately by return e-mail, delete this e-mail and destroy any copies. Any dissemination or use of this information by a person other than the intended recipient is unauthorized and may be illegal.