You probably should appeal to your company in that case to make an exception, because there's not much use in anyone here reinventing the wheel for you.

MIME::Lite is a pure perl module, and doesn't really need to be installed, worst case scenario you could unpack the whole thing into the same directory as your cgi/script.

Does your company not allow any use of modules, even ones that you maintain?

In reply to Re^3: Sending attachments in emails using SMTP by thunders
in thread Sending attachments in emails using SMTP by biswanath_c

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