Some tips and templates for Cold Mailing

With the present market situation, nowadays you don't even get an OA Link/Interview call even though applying with a referral, no wonder how good my portfolio is. On-campus placements are a bloodbath. Good knows how they shortlist candidates. Almost the same name in every list. Meanwhile, I discovered cold mailing. Saw some posts where they got internships via cold mailing. Need some good templates and tips for Cold mailing HRs, managers, and directors.