system
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Are you using a hotmail account or a pop3 account?
2 MB attachement is almost overkill for a default hotmail-account.
You mention having a upload speed off 128 kb/sec,…
My upload speed is only 16 kb with DSL,…and no troubles regarding the speed,of sending emails with attachement.
I have in my outlook: 4 pop3 accounts and 3 hotmail accounts.
Maybe your attachements are simply too heavy to handle?