Gmail is not required to use DOCLINE.  The system uses Google accounts for secure login only. NLM suggests users set up individual Google accounts based on existing work email addresses. For instructions on how to sign up for and login to DOCLINE using a Google account, please follow these instructions

DOCLINE has moved to using the National Institutes of Health’s (NIH’s) solution for user authentication via Google because it centralizes account maintenance for NLM web resources, offers tremendous security improvements, and improved user self-service like ‘I forgot my password’.