I've been using Perl for the last 6+ years, and I don't even remember cgi-lib.pl :)
I don't see a problem printing possibly tainted data to a file, but it really depends on what that file will be used for. I suppose you could say that untainting that data would be the responsibility of the program that *reads* that file. But my inclination would be to untaint the data before writing it to the file. I don't have much experience with -T taint mode, but I believe that if you intend to add the -T flag, that you'll have to untaint all external data (like form data) coming in first before using it anyway - so it's kind of a mute point.
As far as piping tainted data to sendmail, I thought I had read something somewhere about the flags to sendmail having something to do with security precautions, but I can't seem to find that. Read the perldocs on "How do I send mail?" by doing
perldoc -q mail
at a command prompt and search (using the forward slash "/") for "sendmail" - you'll find it. There are some slight sendmail flag differences between your code and what they suggest - I'm not sure if those differences are significant.
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