Outlook 2003 with SP3 - attachments >= 2MB will not send



I have Microsoft Outlook 2003 with SP3 and the O/S is Vista. All has been
working fine until lately when sending emails with large attachments >= 2MB,
they will not send and I get the following error message:

Task (e-mail address removed) - Sending reported error (0x8004210B): The operation
timed out waiting for a response from the sending (SMTP) server. If you
continue to receive this message, contact your server administrator or
Internet service provider
Task '(e-mail address removed) - Sending' reported error (0x800CCC0B): 'Unknown

How ca I fix this please?

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