My externship instructor offered to some of us letters of recommendation. I just contacted him so that I could take him up on this offer and he told me to just write the letter and he'll sign it. This completely threw me for a loop but I just finished the letter. Has anyone had to do this before? Also, I'm applying for multiple jobs, do I need to include the date on the letter? How important is it that I address it to a specific job? As I want to apply to numerous jobs so I cant ask him to sign multiple ones.