Newish install of SBS 2008. I have tested Exchange and things have been going fine. Reverse DNS is setup with our ISP and mail flow has been working well for the most part both receiving and sending. This morning I had a user email about 40 external addresses with an attachment of about 1.5mb. The network (Internet) came to a complete slow down. Tested my Internet Service and we were getting .6mb/sec on a 5mb line. When I looked in the Exchange 2007 Management Console and then to the Queue Viewer it has about 90 DNS connectors there saying Active or Retrying. I had to remove them all since it was killing the network. Is there a better way for my user to send out that type of email again? I believe she has a distribution list in her contacts that contains all those addresses and that is how she sent it out.

Did you look at the original e-mail message? If you have 90 connections that were Active or Retrying, then clearly there was more than 40 external addresses. Unless you killed some other messages as well. Short of telling your users not to do it, there is really not much of a good way to send out large attachments. If those 40 external addresses were all at different domains, this means that your server would have to send out 60MB+ to the Internet.Ifyou frequently pass attachments out to groups ofexternal customers, you might consider standing up an external SharePoint site or some other type of Web site and then merely point your customers to the right link.Your WAN link is still going to take a hit, but over a longer period of time rather than right after the user clicksSend.Jim McBee - Blog - http://mostlyexchange.blogspot.com

SBS 2008 has a 10 MB default message size limit for sending and receiving. A message to a distribution group is counting as one message. The attachment is 1.5 MB. So everything should be fine here. When you are sending to 40 recipients, you are sending 60 MB. If you have 6 Mb/s upstreams, it should not take more than about 90 seconds to send these messages.Either I'm wrong in my understanding of how message size restrictions work with distribution groups to the Internet, or you have a much lower upstreams speed.Have you tested your speed on www.speedtest.net (they have a nice application for the iPhone / iPod touch as well)?With large attachments, you could use the concept of "single instance storage" (SIS). In Exchange up to 2007 an attachment to multiplerecipients within the same database is only stored once (in Echange 2010 ther is no more SIS". The others get a pointer. By the same token, you could put the attachment on a web page and send links.jas

I have told the user to point the recipients to our website where they can get those types of things (pdf's). The issue now is she had 288 email addresses that she put in the BCC field. Basically all she did was select all of her contacts and put them in that field in outlook. Taking the attachments out of the equation how should I set this up for him when she needs to contact these people? Outlook itself I think has a list limit of around 90 addresses depending on the amount of information on the contact card. From my reading exchange 2k7 will treat a DL as one recipient but this is a DL in her Outlook not one I have created in Exchange. Do I need to do this for her on my server. I just don't want the server and internet taking another hit like it did.

Hi,For the DL, please create the DL in the Exchange, then add the the contacts to that DL. After that, the Exchange server can treat the DL as one recipient and expand DL.ThanksAllen