Electronic recommendation letter tips Is it possible the recommendation letter be sent directly to the recruiter by the person who writes it? 

Also, does the letter needs to be signed by hand? Maybe is enough to see that the letter comes directly from the sender, but is not signed.

Thanks
As a letter writer, I either email the PDF directly to the hiring department or I use a letter service such as Interfolio. I never give it directly to the student.

I also insert both a scanned image of my signature as well as a digital cryptographic signature embedded into the PDF, with a note that the digital signature can be authenticated through Adobe Reader.