Reference letter over email

[Canada_aspirant_2019]

Has anyone submitted Job duties reference letter as an email copy. A senior colleague is willing to mention my job duties ( HR said they won't). Should I ask him to print on white plain paper and sign below and add business card? or if he mentions the job duties in an email(company email) to me and I print the email which will serve as proof that he works in the same company? Also do I need to notarize the document?

Please let me know or point me to the thread, I was unable to find any related thread.

Thanks!