--- Which version of NOD32 are you using?
Does your NOD32 have the option to scan outgoing emails checked? (Possibly 'Enable Email Protection')
If so, try unchecking it and try resending.
Just had another thought;
--- Is your Outlook Express set to use Port 25 for outgoing SMTP mail ?
Check your
Outgoing server settings. If it is set to Port 25, try changing it to Port 26.
Some I.S.P.'s block Port 25 for 'security reasons / spam'.
(
usually for 3rd party email services like PoBox.com though, this may not be your issue)
--- It's not the size that's the problem:
7. How large can my email messages be?
Using Webmail, you can send messages up to 5 MB in size. When sending through shawmail (e.g., when sending through an email program such as Outlook Express), your messages can be up to 7 MB in size.
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