What happens if you open MAIL for writing? 
# now: open (MAIL, "|/usr/sbin/sendmail -t")
open (MAIL, '>', "|/usr/sbin/sendmail -t")

[download]
 Udate: didn't notice the | at small font size at my end. The 2 arg version will work as written. the 3 arg version would be: open (MAIL, '|-', "/usr/sbin/sendmail -t")

Weird, the open() works, but the close() fails. Does the print() work? Nobody ever checks this, but it does return a status like open or close.

In reply to Re: sendmail close error by Marshall
in thread sendmail close error by vit

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