Let me start by saying that I have read countless articles on changing the message sizes in Exchange 2007, and I am pretty much out of ideas. The problem I am having is that after changing several variables in the Exchange management Shell, Exchange is able to receive messages with large attachments from my POP3 host server. However, the messages are not being delivered to the recipients. One random message that failed is reporting: "550 5.2.3 RESOLVER.RST.SendSizeLimit; message too large for this sender". Here are the setting I changed: transportconfig -maxreceivesize 30MB transportconfig -maxsendsize 30MB all mailboxes' maxsendsize and maxreceivesize are unlimited all three of my receive connectors, including the Windows SBS Fax Sharepoint Receive <servername> maxmessagesize 30MB There might be others I missed, but I've set everythign I can think of to 30MB or unlimited. I'm really out of ideas. Can anyone help? As stated in the subject, I am running SBS 2008, but since I am pulling email from the POP3 connector, I assume the problem is somewhere within Exchange and the fact I'm running SBS is irrelevant. Thanks, Chris

I am not SBS expert but I guess POP3 connector has 10MB limit and can not download message with more than 10MB... However suggest you to check about this limitation and workaround (if any available) in SBS newsgroup since POP3 connector is a feature of SBS family... SBS 2008 Newsgroup...:https://connect.microsoft.com/sbs08/community/discussion/richui/default.aspx?wa=wsignin1.0 SBS 2008: Introducing the POP3 Connector http://blogs.technet.com/sbs/archive/2009/07/01/sbs-2008-introducing-the-pop3-connector.aspx -==-==-==-==-==-==-==-==-==-==-==-==-==-==-==- Message Size Limit Messages exceeding 10MB will not be downloaded by the POP3 Connector; no event will be logged for this. If you suspect that this is happening, install the telnet client on SBS 2008 and manually connect to the POP3 server to see the message size. -==-==-==-==-==-==-==-==-==-==-==-==-==-==-==- Amit Tank | MVP Exchange Server | MCITP: EMA | MCSA: M | http://ExchangeShare.WordPress.com

Hi,This articles may help you. Managing Message Size Limits http://technet.microsoft.com/en-us/library/bb124345.aspxPop connector in SBS 2008 how to change maximum message sizehttp://www.microsoft.com/communities/newsgroups/en-us/default.aspx?&dg=microsoft.public.windows.server.sbs&p=1&tid=6b9e25a4-81ff-4670-9ef5-cf12e10be27b MCSE,CCNA,VCP,APP