I have a SBS 2003 server. With exchange 2003. My Problem is when I send a large attachment (5mb or more) The Internet slows way down. Pages take forever to load. So I check my System manager in exchange and look at the queues and can see some large emails going out. I have dsl which is slow like 16up and 1.5 down. I just upgraded my winnt4 and a exchange server 5.5 to this new sbs. When I was running the exchange 5.5 it still had the same problem. I have use like my gmail account to send a 30mb file and while it was uploading my internet ran just fine. SO something only when sending large attachments through exchange is slowing the internet down. I hope this make sense.
Thanks for your help
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I agree with Exchange_Admin.
Let's say you are sending a message to 5 people and it is a 5MB attachment. That actually means 25MB worth of binary. Once it is converted to text (uue or b64), it will be around 6MB of data, or 30MB total. If you have a
GMail usually only allows a 10MB attachment last I remember. However, let's say that you send a 10MB attachment to 5 people. Yes, you are sending 50MB total. Under my previous example, it would be 60MB once converted to text. The issue there is that you are uploading a single attachement and Google's network is taking the hit for sending it to 5 recipients.
In addition, your DSL provider may shape traffic to make SMTP more important than HTTP traffic.
you must understand that as you send mail out, you are using your upload. understandibly, you probably have less than 500kbs upload, and will probably saturate it if you send one mail to a "fast" recipient server, such as yahoo.
You could limit the amount of outbound concurrents, or be restrictive on your attatchment policy.
I propose that at 6:00 it is dinner time =^).
E_A and Yuja primarily. My post and phatcows post expanded on what they had already said. However, this was a very low point question, so a split amongst 4 is not really likely.
Since it is an SMB market, we definitely don't want to pull out the "get more bandwidth", "drop in a packeteer or other packet prioritization device and place SMTP at the bottom".
Though this is not an answer - I would denote that they will likely want to consider attachment size limits, sharing large files with an upload service and not using Exchange as a file sharing system until they upgrade their bandwidth.
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by: Exchange_AdminPosted on 2006-01-24 at 09:39:56ID: 15777862
This makes sense. I would expect to see this. Are you sending this email to multiple external recipients? If so then each recipient is sent a message with the attachment.
You mention that using Gmail everything worked fine. This is probably because this is using HTTP instead of SMTP.
Maybe some others on the forum will offer advice.