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Setting a maximum attachment size
By default IBM® Lotus® Domino™ Web Access allows a maximum attachment size of 50,000K (50MB). You can increase this amount by setting the "Maximum attachment size (kb)" field in the Domino server Configuration Settings document, Domino Web Access tab. However, attachment size is based on two parameters that default to a 10,000K (10MB) limit independent of this setting. So even though Domino Web Access allows for a larger attachment, the following two settings must be increased to a value larger than the Domino Web Access maximum attachment setting for users to be able to add attachments larger than 10MB.

In the Server or Web Site document, set these settings higher than the Domino Web Access "Maximum attachment size" field: