in reply to Re^4: sendmail with perl
in thread sendmail with perl

It would appear that Net::SMTP is indeed a core module:

MIME::Lite doesn't appear to be.

You can install modules you'd like into your home dir without even switching to root. Then if your hosting provider reinstalls or upgrades perl behind your back, your installed modules will still be there. (I happen to have asked about that a while back myself: CPAN non-root questions.)