I think the problem may be that you've specified the TYPE option on your FILENAME statement. Try changing it to specify that the attachment is plain text rather than HTML, such as:
filename outfile email
to =...@something.com'
replyto=...@something.com'
subject= "Weekly Report"
attach= ("/home/mydocs/coverage.xls" content_type="text/plain")
type="text/html";
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