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Something about the attachment is triggering Gmails filters. What is the attachment? How large a file? I think Gmails's limit is 25mb. Typically, it is far better to share documents and other large files that are hosted somewhere else, then just send the link via gmail. At work I use Sharepoint to do this with large files, but on the other hand I frequently send modest attachments like PDFs and Word documents to Gmail users and it works fine.
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