Hi! in the last days our bandwidth usage jumped up to abput 11-12 mb each 5 minutes. After a bit of research we discovered, that the POP3 Connector isn't able to fully download a mail. Hence it tried it every 5 Minutes. We now deleted that mail and everything works fine again. After looking through the logs we found out, that the POP3 Connector did not dowload that mail because of its size (too large). But one question remains: Why does it try to download the mail even if it knows, that it is too large? Shouldn't the connector just skip that mail and not even try to download it? Maybe I even misinterpreted the logs? Cheers! [t 0] 10/13/10, 01:35:34: Unfamiliar error delivering mail: 552 [t 0] 10/13/10, 01:35:34: Full response details: [t 0] 10/13/10, 01:35:34: SMTPRESPONSE: * * * !Failed! * * * [t 0] 10/13/10, 01:35:34: * * * * * * [t 0] 10/13/10, 01:35:34: * * * 0x800ccc6d * * * [t 0] 10/13/10, 01:35:34: Command: [SMTP_DOT] [t 0] 10/13/10, 01:35:34: Completed: Yes. [t 0] 10/13/10, 01:35:34: IxpResult: [t 0] 10/13/10, 01:35:34: ---> ---> ---> hrResult: 0x800ccc6d [t 0] 10/13/10, 01:35:34: pszResponse: 552 5.3.4 Message size exceeds fixed maximum message size [t 0] 10/13/10, 01:35:34: uiServerError: 552 [t 0] 10/13/10, 01:35:34: dwSocketError: 0 [t 0] 10/13/10, 01:35:34: pwszProblem: <none> [t 0] 10/13/10, 01:35:34: EVENT: Because of transient or unknown failures, one or more messages (1) could not be delivered to '.............' on the SMTP server 'localhost'. The messages will be left on the POP3 server. If these failures continue to occur, you can either connect to the POP3 account and retrieve or delete the messages manually, or resolve the problem causing the errors. For more information, see the log file at "C:\Program Files\Windows Small Business Server\Logs\pop3connector\pop3service.log". [t 0] 10/13/10, 01:35:34: WARNING: Item 1 is too big (11184286 > 10485760) to download. (pop.........com:110:"...") [t 0] 10/13/10, 01:35:34: EVENT: One or more messages (1) were left in the '.....' account on the POP3 server 'pop.......com' because they are larger than the maximum acceptable message size (the largest message is 11184286 bytes). You can either connect to the POP3 account and retrieve or delete the messages manually, or increase the maximum acceptable message size in Exchange Server.

On Thu, 14 Oct 2010 02:45:26 +0000, Danic_ wrote: >in the last days our bandwidth usage jumped up to abput 11-12 mb each 5 minutes. After a bit of research we discovered, that the POP3 Connector isn't able to fully download a mail. Hence it tried it every 5 Minutes. We now deleted that mail and everything works fine again. After looking through the logs we found out, that the POP3 Connector did not dowload that mail because of its size (too large). But one question remains: Why does it try to download the mail even if it knows, that it is too large? Shouldn't the connector just skip that mail and not even try to download it? Maybe I even misinterpreted the logs? There's no POP3 Connector in Exchange. It's part of SBS. You should ask this question in the SBS forum. --- Rich Matheisen MCSE+I, Exchange MVP --- Rich Matheisen MCSE+I, Exchange MVP

Hi, We can set limitation in 5 levels: Organizational, Global, Connector, Server, User. Please check if you set them properly. Managing Message Size Limits http://technet.microsoft.com/en-us/library/bb124345(EXCHG.80).aspx If you still have problem regarding pop3 connector, I suggest you write the post in our SBS newsgroup: http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.windows.server.sbs&cat=en_US_77750084-cabb-4056-9708-d9264353c1b3&lang=en&cr=US Thanks, Novak Wu-MSFT