Mail::Mailer does use a piped open. From my version of Mail::Mailer (in MailTools 1.60) about line 226:

    # Fork and start a mailer
    (defined($exe) && open($self,"|-")) # (snip)

[download]

I don't know enough about packages to know if this is a potentially harmful open call, but I can understand how the taint checking is complaining about the path.

In reply to Re^3: Mail::Mailer and difficulty with -T taint mode by Nkuvu
in thread Mail::Mailer and difficulty with -T taint mode by davido

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