1. Go to "Server document > Internet Protocols > HTTP > HTTP Protocol Limits", set "Maximum size of request content" to "10000" kilobytes.
2. Go to "Server document > Internet Protocols > Domino Web Engine > POST Data", set "Maximum POST data (in kilobytes)" to "10000".
3. Go to "Configuration Settings document > Domino Web Access > Mail", set "Maximum attachment size (kb)" to "50000".
4. Go to "Configuration Settings document > Domino Web Access > Other settings", set "Domino Web Access ActiveX file attachment utility" to "Enabled".