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There is a message that is not over-sized but it is getting blocked for being over-sized. Answer/
When GWAVA's oversize scan is being run, it will look at the size of the mime file, not the total size of all of the attachments. These two numbers will be different due to the base 64 encryption applied to the attachments and the mime file size will generally be larger. If mail is being blocked like this, you will need to increase the oversize threshold in your GWAVA Management Console.
This article was originally published in the GWAVA knowledgebase as article ID 1401.