in reply to Re^3: Excel-Writer-XLSX : Excel file with warning messages
in thread Excel-Writer-XLSX : Excel file with warning messages
I can only speculate that your email script is sending the link before the file is completely written, but the fact that it has all the content makes me think that is unlikely. Maybe you are using an older version of Excel::Writer::XLSX and it has been since fixed? (The change log does not indicate anything, though, and the git log has the most recent changes to the close() method at eight years ago).
It is easier to diagnose issues if you provide a short, self contained, correct example.